Is shark birthday decorations profitable to sell on Amazon United States?

The niche generates $449K/yr across 49 tracked products. 4 of 12 products launched in the last 360 days are still selling. 90-day search growth is +100.5%. Flapen's verdict: Worth a look (65/100).

How competitive is the shark birthday decorations niche?

43 brands and 56 sellers compete. The top 5 products take 36% of clicks and top 5 brands hold 42% of demand.

What do buyers complain about in shark birthday decorations?

Top complaints mined from reviews: Durability, Quality-Overall, Size-Overall. The return rate is 4.1%.

When does demand for shark birthday decorations peak?

Demand peaks in Jun–Jul–Aug; the busiest month runs 7.3× the quietest.

What does it cost to enter the shark birthday decorations niche?

Listings span $2.85–$29.76; the average listing price is $14.40 (sweet spot $15–$100). The average incumbent carries 844 reviews — the moat a new listing must climb.

shark birthday decorations

Worth a look

Shows no brand lock-in (top 5 brands take 42% of clicks), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Brand share

Great42%

top-5 brand share — no brand owns this niche

Growth

Great+100.5%

90-day search growth — must beat 0% to launch

Competition

Great36%

top-5 click share — an open shelf

Avg price

Good$14.40

avg listing price — sweet spot $15–$100

Review moat

Good844.49

avg incumbent reviews — the moat a new listing must climb

Conversion

Good5.0%

search→purchase rate — share of searches ending in a sale

Market size

Good$449K

$449K/yr · 618K searches

Price range

Good$2.85–$29.76

cheapest to priciest tracked listing — scored on the share inside $15–$100

Returns

Okay4.1%

return rate — above 5% kills the launch gate

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

According to Flapen's Amazon United States niche tracking, shark birthday decorations is a $449K/yr Amazon United States market (618K searches/yr). The top 5 brands hold 42% of demand. Demand peaks in Jun–Jul–Aug. Verdict: Worth a look — 65/100.

Data updated Jul 23, 2026 · scored weekly · How we score niches

shark birthday decorations market data

Units sold / yr: 25K–30K; avg 500–750/product
Revenue / yr: $360K–$432K; units × avg price
Conversion rate: 5.0%
Avg BSR: #1,777
Page quality: 0%
Prime: 100%
Sponsored: 94%
Out of stock: 5.5%
Avg brand age: 28 months
Avg seller age: 166 days

Competition & brand share

Clicks spread well past the top 5 (36% combined) — an open shelf where new products get seen.

Brands

43 falling

Sellers

Top-5 brand share

42%

Top 20: 77%

Top-5 click share

36%

Top 20: 71%

Open market

54%

LINHAXM13%
Generic10%
Glad8%
WERNNSAI6%
CMUSKO5%
Bafeil3%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +100.5% search growth over the last 90 days.

Peak months: Jun, Jul, Aug · busiest ÷ quietest = 7.3×

Open Trend

Top shark birthday decorations search terms

shark birthday party decorations141K/yr +38.2%2.4% conv.
shark party decorations89K/yr +107.8%2.3% conv.
shark party49K/yr +133.0%1.4% conv.
shark decorations52K/yr +136.5%2.1% conv.
shark week decorations25K/yr >1,000%1.9% conv.
shark birthday decorations43K/yr +61.5%2.5% conv.
shark birthday38K/yr +45.2%1.7% conv.
shark themed party decorations39K/yr +79.8%1.9% conv.
shark decorations for party25K/yr +108.7%2.8% conv.
shark party supplies20K/yr +142.0%1.5% conv.

All search terms

Top shark birthday decorations products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

LINHAXM 157 PCS Shark Birthday Party Decorations Includes Plates Napkins Cups Cutlery Cake Toppers Banner Hanging Swirls Tablecloth Balloon for Under The Sea Party Decorations

LINHAXM$21.224.7★434 rev

Glad for Kids 8.5 Inch Round Paper Plates Cute Sharks Design Heavy Duty Cut-Resistant and Soak-Proof Disposable Plates Microwavable Kids Tableware for Meals Parties Snacks 20 Count

Glad$2.854.8★595 rev

Shark Birthday Party Supplies Shark Theme Style Party Include Happy Birthday Banner Backdrop Tableware Set Tablecloth Hanging Swirls Cake Toppers Cupcake Toppers Latex Balloons(A)

Generic$21.414.8★150 rev

Shark Birthday Party Decorations 190Pcs Shark Party Supplies Tableware Set with Plates Napkins Cups Tablecloth Banner Hanging Swirls Balloons Cake Topper Cupcake Toppers for Under The Sea Party Decor

CMUSKO$20.704.9★38 rev

Bafeil Shark Party Door Banner Decorations with Blue Foil Fringe Curtains

Bafeil$15.884.4★28 rev

Newest

by launch date

Srua Don Shark Birthday Party Decorations Ocean Theme Shark Party Supplies for Birthday Baby Shower Paper Plate Cup Napkin Backdrop Topper Tablecloth Balloon Swirl Cutlery Banner Serves 24

Srua Don$23.3814 rev

5mo ago

Shark Birthday Candles Shark Party Decoration Supplies Birthday Number Candles for Cake Topper (Blue Number 4)

Candoll$5.979 rev

6mo ago

287pcs Shark Birthday Party Decorations Complete Party Set Serves 25 Guests Shark Birthday Decorations includes Banner Balloon Arch Backdrop Plates Tablecloth for Shark-theme Party

Fexivo$29.5158 rev

8mo ago

SUNBEAUTY Shark Birthday Party Decorations Shark Birthday Banner Ocean Theme Party Decoration Under The Sea Shark Garland Blue Ocean Swirls Hanging Wall Decor for Boys Baby Shower Beach Summer Party

SUNBEAUTY$15.66560 rev

8mo ago

Bafeil Shark Party Door Banner Decorations with Blue Foil Fringe Curtains

Bafeil$15.8828 rev

11mo ago

What buyers say about shark birthday decorations

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall17%

“Product is great as expected no issues”

Color10%

“The colors are pretty”

Value For Money9%

“Price was reasonable”

Advertised Vs Actual Product7%

“Exactly as pictured”

Size-Overall5%

“Good size”

Design-Overall5%

“The designs are fun and cohesive, and its honestly one of the most complete birthday decoration kits Ive come across”

Durability5%

“Very durable”

Assembly/Installation4%

“Easy to assemble”

Gifting Purpose4%

“Such a fun gift”

Taste-Overall4%

“These gummies are very tasty”

What buyers complain about

Durability17%

“But falls apart easily”

Quality-Overall14%

“not well made”

Size-Overall12%

“Poor fit”

Strength8%

“it was very flimsy”

Adhesion/Stickiness7%

“Not sticky enough”

Smell6%

“had a strong plastic smell”

Thickness5%

“Was alittle thick”

Assembly/Installation4%

“Poor assembly - parts didnt fit”

Stitch/Finish/Polish2%

“Seams are trash”

Material Quality2%

“The material was very cheap”

Top return reasons

Size-Overall36%

Color11%

Length9%

Value For Money7%

Advertised Vs Actual Product5%

Quality-Overall4%

Gap/Hole3%

Material Quality3%

Defective Material/Parts3%

Adhesion/Stickiness2%

Common questions

Is shark birthday decorations profitable to sell on Amazon United States?: The niche generates $449K/yr across 49 tracked products. 4 of 12 products launched in the last 360 days are still selling. 90-day search growth is +100.5%. Flapen's verdict: Worth a look (65/100).
How competitive is the shark birthday decorations niche?: 43 brands and 56 sellers compete. The top 5 products take 36% of clicks and top 5 brands hold 42% of demand.
What do buyers complain about in shark birthday decorations?: Top complaints mined from reviews: Durability, Quality-Overall, Size-Overall. The return rate is 4.1%.
When does demand for shark birthday decorations peak?: Demand peaks in Jun–Jul–Aug; the busiest month runs 7.3× the quietest.
What does it cost to enter the shark birthday decorations niche?: Listings span $2.85–$29.76; the average listing price is $14.40 (sweet spot $15–$100). The average incumbent carries 844 reviews — the moat a new listing must climb.