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Under the Sea Party Theme
Everything You Need for the Perfect Party
Hundreds of decorations, tableware, balloons & accessories — all at bulk prices. Celebrate every occasion in style.
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Beistle
Shark Fin Headband
from $4.90
White shark fin on a headband: the whole costume in one move. It snaps on quickly and works for guests of all ages, kids and adults both circling the snack table in character.Durability matters more than usual on anything shaped like a dorsal fin, and this one holds up. Sold by the package (1 headband) or by the case (12 headbands); the case turns a pool party into a feeding frenzy.
Beistle
Under The Sea Theme Party Paper Plates 9 inch
from $4.55
Sea creatures in full color on 9-inch paper plates, eight to a package. The 9-inch round handles the main course at a luau or under the sea party, and paper means cleanup is a trash bag rather than a sink full of dishes.Sold by the package (8 plates) or by the case (96 plates).
Beistle
Fabric Diver Helmet
from $21.75
Make a splash at your under the sea party with this vibrant Fabric Diver Helmet. Designed to fit most, it adds a fun and unique touch to any ocean-themed event. Perfect for group costumes or individual wear, this helmet brings the adventure of underwater exploration to life with bright gold and silver colors.
Color: Gold/Silver
One size fits most
Made of quality fabric
Includes fabric brim and fin with bright, printed colors
Sold by the package (1 helmet) or by the case (6 helmets)
UPC: 034689005469
Beistle
Jointed Octopus Party Decoration
from $7.35
Under the sea parties tend toward static decor: fish taped to walls, streamers hanging still. A jointed 32-inch octopus helps with that, since the sections move where you pose them; bend an arm around a doorframe or reach one toward the snack table. Printed on one side, so it belongs flat against a wall or door.
Color: orange
Sold by the package (1 jointed decoration) or by the case (12 jointed decorations)
Beistle
Luau Party Sea Creatures Mini Centerpieces
from $4.90
Four mini centerpieces per package, 5.5 inches tall, in teal and purple sea-creature designs made mostly of tissue. Mini is the operative word: these scatter across several tables rather than anchoring one, and at this height they never block a conversation or crowd the food.A package dresses a table or two; the case of 48 handles a banquet room. Sold by the package (4 centerpieces) or by the case (48 centerpieces).
Beistle
Whale Hat
from $16.80
Foam whale hat in blue and red, one size fits most. Foam is the right call for a novelty hat: it keeps its shape, weighs next to nothing, and doesn't mind being passed around for photos all afternoon. For an Under The Sea party, one on the host and a stack by the door settles the dress code.Sold by the package (1 hat) or by the case (12 hats).
Beistle
Luau Party 3-D Coral Reef Centerpiece
from $4.90
Under-the-sea tables usually get flat decorations; this 10-inch coral reef centerpiece works in three dimensions, with 10 fish dangling off the reef that stir whenever someone walks by.Assembly is required, but instructions are included and the build is simple; budget minutes, not an evening. Sold by the package (1 centerpiece) or by the case (12 centerpieces).
Beistle
Under The Sea Party Luncheon Napkins
from $4.55
Ocean scenes in full color cover these under-the-sea luncheon napkins, 6.5 by 6.5 inches folded and two-ply throughout. Mermaid birthdays and aquarium-themed parties are the obvious calls, but they work for any beach-adjacent table that needs soft, absorbent backup.
Material: paper
Sold by the package (16 napkins) or by the case (192 napkins)
Beistle
Plush Sea Turtle Hat
from $19.50
Add a splash of ocean fun to your Under The Sea party with this Plush Sea Turtle Hat. Soft and detailed in green and brown, it fits most head sizes comfortably, making it a delightful accessory for guests of all ages. Perfect for creating memorable moments at your themed event.
Color: Green/Brown
One size fits most
Made of soft, plush material
Sold by the package (1 hat) or by the case (6 hats)
Beistle
Luau Party Undersea Backdrop
from $22.50
Blue from end to end, 4 feet tall and 30 feet long, this undersea backdrop is the base layer of an under-the-sea setup. It covers a wall in one run; the sea creature props go on top of it afterward.On its own, it is also the fastest way to put a lot of ocean behind a head table or photo spot. Sold by the package (1 backdrop) or by the case (6 backdrops).
Beistle
Jointed Seascape Party Decoration
from $9.75
Transform your Under The Sea themed party with a vibrant, two-sided seascape decoration that brings ocean beauty right to your celebration. This eye-catching piece is perfect for birthdays, pool parties, or summer events, adding a splash of color and charm to your décor. Easy to assemble and designed to impress, it sets the perfect scene for your guests.
Color: Multicolor
Size: 25" x 3' 1"
Two-sided seascape design
Made of durable paperboard
Easy to assemble for quick setup
Perfect for Under The Sea themed parties, birthdays, pool parties, and summer celebrations
Sold by the package (1 Jointed Decoration) or by the case (12 Jointed Decorations)
Beistle
Under The Sea Party Props
from $10.50
Nine multicolor undersea cutouts per package: sea horses, conch shells, and starfish in sizes from 9.25 inches up to 5 feet 7 inches, which is taller than some of the people at the party. The big piece anchors the wall; the small shells fill the gaps around it.They're printed on thin plastic, which keeps them light and makes decorating straightforward, whether that's a full backdrop or scattered scenes around the room. Sold by the package (9 props) or by the case (54 props).
Beistle
Jointed Sea Turtle Party Decoration
from $7.35
Bring a splash of ocean fun to your Under The Sea party with this vibrant 3-foot Jointed Sea Turtle decoration. Its lively green and brown colors and articulated design add movement and charm, creating an engaging centerpiece that will delight guests of all ages. Perfect for creating memorable party moments with ease.
Color: Green/Brown
Size: 3'
Printed on one side
Jointed figure design for added movement
Sold by the package (1 jointed decoration) or by the case (12 jointed decorations).
Beistle
Shark Fin Decoration Party Picks
from $2.87
Fruit trays, cheese cubes, and appetizer platters all take the same upgrade from these 2.5-inch shark fin picks: stab one into each bite and the buffet matches the theme. Fifty per package covers a real spread, and the gray and beige fin shape registers immediately as a dorsal fin cruising through the food.They are durable enough to survive repeat grabs from small hands. Sold by the package (50 picks) or by the case (600 picks).
Beistle
Luau Party Tissue Bubble Fish
from $4.20
One tissue bubble fish, 12 inches long, in multicolor paper with metallic accents that catch the light whenever it moves. Hang it from a ceiling or against a wall; a school of them at different heights is what actually sells the under-the-sea effect.Sold by the package (1 fish) or by the case (12 fish).
Beistle
Luau Party Coral Reef Prop
from $10.50
Under the Sea and luau setups share the same problem: a big blank wall behind the buffet. This flat prop covers it with a multicolor coral reef scene, three fish included, and since it mounts flush to the wall it works in hallways and tight rooms where a 3-D decoration would get knocked around.
Size: 5' 3" x 5' 3"
Sold by the package (1 prop) or by the case (12 props)
Beistle
Shark Party Cupcake Stand
from $9.00
Cupcakes need height on a party table, and this 14-inch cardboard shark stand supplies it while doubling as the centerpiece. Assembly is required, so put it together before the frosting run, not during; once built, the cardboard is sturdy enough to hold a full load of cupcakes.
Color: blue/gray
Sold by the package (1 cupcake stand) or by the case (12 cupcake stands)
Beistle
Luau Party Plush Crab Hat
from $19.95
Nobody wears a crab hat halfway. This one is soft plush in red and black, one size fits most, and comfortable enough that the joke lasts the whole party instead of ten minutes.It shows up in every group photo whether invited or not, and it works as well at a seafood boil as at a luau. Sold by the package (1 hat) or by the case (6 hats).
Beistle
16.75 Inch- Under The Sea Fish Party Cutouts
from $5.60
Big fish: 14.5 to 17 inches each, four per package, printed on both sides. Hang them from the ceiling at different heights and the room starts to feel underwater, which is exactly what an Under the Sea theme needs. Multicolor, so no coordinating required.Sold by the package (4 cutouts) or by the case (48 cutouts).
Beistle
Luau Party Fish Cutouts
from $7.00
Six multicolor fish cutouts per package, ranging from 14.25 to 16.75 inches and printed on both sides. Double-sided matters: hang them in a window or from the ceiling and there is no blank side facing anyone.They pull duty in classrooms and offices as readily as at parties. Also sold by the case (72 cutouts).
Beistle
Luau Party 3-D Glittered Fish Centerpiece
from $4.90
Glitter earns its keep on a centerpiece because table decor sits at eye level under direct light, and this 13-inch 3-D fish in pink and green catches all of it. Assembly is required, so put it together before the tablecloths go down.One works for a small gathering; the case of 12 handles a full banquet room in an Under the Sea theme. Sold by the package (1 centerpiece) or by the case (12 centerpieces).
Beistle
Shark Headband
from $8.93
Snap-on shark headband with the full anatomy: detailed eyes, teeth, and fins in gray and red, riding on a band that fits most head sizes. Lightweight matters here; a costume piece worn on the head for three hours needs to be forgettable, and this one is. It is durable enough to survive trick-or-treating too.Sold by the package (1 headband) or by the case (12 headbands).
Beistle
Luau Party Tissue Lobster
from $5.60
Seventeen inches of red and black tissue lobster in a half-round design, which means it sits happily against a wall or the back edge of a buffet where a full-round centerpiece would waste half its effort. If your luau menu leans seafood, this is the decoration that matches it.
Material: paper
Sold by the package (1 lobster) or by the case (24 lobsters)
Beistle
Bubble Party Cutouts
from $7.00
Transform your Under The Sea celebration with vibrant bubble cutouts that add a splash of fun and color to any space. These multicolor cutouts come in assorted sizes, perfect for creating a dynamic and festive atmosphere that delights guests from every angle.
Color: Multicolor
Size: Assorted sizes including 4-inch, 8-inch, and 12-inch cutouts
Double-sided prints for visibility from all angles
Includes 20 cutouts per package
Sold by the package (20 cutouts) or by the case (240 cutouts)
Beistle
Shark Fin Decoration Party Centerpieces
from $8.40
Three shark fins per package, sized at 6.25 by 6.75 inches, which is right for cutting down the middle of a food table or circling the cake. The silver and teal coloring reads more ocean than cartoon, so they hold up at adult shark week viewing parties as well as kids' birthdays.Sold by the package (3 centerpieces) or by the case (36 centerpieces), enough to menace a dozen tables.
About Under the Sea Party Theme
Dive into an enchanting underwater world with our captivating collection of under the sea-themed party decorations! Whether you're hosting a birthday bash or an ocean-inspired celebration, our assortment captures the magic of the deep blue sea. From shimmering sea creature cutouts to sparkling mermaid banners, our decorations transport your guests to a whimsical marine paradise. Add a splash of color with vibrant fish balloons, or create an immersive experience with coral reef centerpieces. Crafted with quality materials and intricate designs, our decorations ensure an unforgettable event filled with wonder and adventure. So, make a splash and let our under the sea-themed party decorations transform your gathering into an oceanic extravaganza!
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"I ordered a few things for my daughter’s birthday. 🎈 was happy with all of it! I will definitely order from here again. Thank you. 😊 Good quality and fast service! 😊👍"
★★★★★
"Great customer service I will say that if you order early in a day, you will get it the next day except for holidays and Sundays. They have tons of cool products for just about any occasion. They also have some nostalgic reproductions that can bring back old memories. Definitely recommend. 5 stars"
★★★★★
"In Love with Beistle products! I recently purchased Beistle die-cut products from Bulk Party Supply, and I'm beyond impressed! The shipping was incredibly fast, and the communication throughout the process was top-notch. The quality of the die-cuts is outstanding—the pumpkins were amazing, the cupids looked terrific, and the hearts were perfect. The packaging ensured everything arrived in pristine condition. Plus, the prices are a great deal! I'll definitely continue doing business with both Bulk Party Supply and Beistle Co."
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