shark boy costume
Skip itA small market ($0/yr) — this niche doesn't clear our bar today.
Avg price
Incredible$34.40avg listing price — sweet spot $15–$100
Quality gap
Good4.3★avg incumbent rating — lower means beatable quality
Brand share
Good62%top-5 brand share — brands hold most of the demand
Review moat
Good671.86avg incumbent reviews — the moat a new listing must climb
Competition
Good43%top-5 click share — leaders hold, buyers still browse
Price range
Good$9.62–$131.79cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Okay+11.5%90-day search growth — must beat 0% to launch
Returns
Bad9.3%return rate — above 5% kills the launch gate
Market size
Bad$0$0/yr · 192K searches
Conversion
Bad0.0%search→purchase rate — share of searches ending in a sale
According to Flapen's Amazon United States niche tracking, shark boy costume is a $0/yr Amazon United States market (192K searches/yr). The top 5 brands hold 62% of demand. Demand peaks in Sep–Oct–Nov. Verdict: Skip it — 44/100.
Data updated Jul 10, 2026 · scored weekly · How we score niches
shark boy costume market data
- Units sold / yr
- 500–750
- avg 0–100/product
- Revenue / yr
- $17K–$26K
- units × avg price
- Conversion rate
- 0.0%
- Avg BSR
- #4,659
- Page quality
- 0%
- Prime
- 75%
- Sponsored
- 72%
- Out of stock
- 54.5%
- Avg brand age
- 43 months
- Avg seller age
- 191 days
Competition & brand share
The top 5 products take 43% of clicks — established leaders, but buyers still shop beyond them.Brands
23 rising
Sellers
28
Top-5 brand share
62%
Top 20: 98%
Top-5 click share
43%
Top 20: 81%
Open market
34%
- Fun Costumes22%
- Touchat18%
- Lucky2Buy8%
- JUOLOET7%
- inkArts6%
- JCJ4%
Demand & seasonality
Weekly Amazon search volume, last 89 weeks — +11.5% search growth over the last 90 days.Peak months: Sep, Oct, Nov · busiest ÷ quietest = 30.9×
Top shark boy costume search terms
- sharkboy costume44K/yr
- shark boy costume32K/yr
- sharkboy and lavagirl costumes26K/yr
- shark boy and lava girl costume10K/yr
- sharkboy costume adult30K/yr
- sharkboy costume kids5K/yr
- sharkboy costumes4K/yr
- shark boy costume adult19K/yr
- sharkboy and lava girl costume adult3K/yr
- sharkboy costume men5K/yr
Top shark boy costume 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Touchat Shark Blanket for Adult & Kids Super Soft Cozy Flannel Throw Wearable Blanket Cartoon Animals Shark Onesie Hoodie Sleeping Bag Cosplay Shark Costume Blanket Gifts for Shark Lovers (Blue M)
Touchat$18.124.5★1,252 rev
Lucky2Buy Womens One-Piece High Cut Superhero Cosplay Leotard Bodysuit Teddy Swimsuit Set
Lucky2Buy$20.304.1★190 rev
Official Shark Boy and Lava Girl Toddler Gray Shark Boy Costume Boys Superhero Jumpsuit Costume
Fun Costumes$58.064.5★330 rev
JCJ Halloween Shark Costumes Stitch Onesie Pajamas for Kids Shark Sleeper Pajama Set Hooded for Boys Girls (9-10Y)
JCJ$26.733.8★56 rev
HSCTEK Shark Onesie Costume Kids Baby Pajamas Cosplay Sleepwear Clothes 16
HSCTEK$29.174.6★270 rev
Newest
by launch date
JUOLOET Unisex Adult Onesie Pajamas Shark Animal One Piece Snug Fit Halloween Costume Sleepwear Homewear Shark X-Small
JUOLOET$25.57471 rev
TBGENIUS Shark Blanket Hoodie Onesie for Adults and Kids Cozy Flannel Shark Costume Shark Sleeping Bag
TBGENIUS$17.74213 rev
Newleafly Unisex Kids Shark Onesie Pajamas Soft Cozy Animal Onesie Halloween Cosplay Costume
Newleafly$24.6415 rev
JUOLOET Unisex Adult Onesie Pajamas Shark Animal One Piece Snug Fit Halloween Costume Sleepwear Homewear Shark Medium
JUOLOET$28.16471 rev
JUOLOET Unisex Adult Onesie Pajamas Shark Animal One Piece Snug Fit Halloween Costume Sleepwear Homewear Shark Small
JUOLOET$30.10471 rev
Trending
90-day click momentum
haikyuu Kid Shark Costume Grey Pink Yellow Blue Fish Hoodie Boy Girl Halloween Birthday Party Dress Up (blue Small)
haikyuu$21.603.6★
CuteCosplay Unisex Kids Shark Onesie Animal Cosplay One-Piece Pajamas Christmas Halloween Costumes
CuteCosplay$20.584.5★
DLiuguangX Unisex Adult Cartoon One-piece Shark Cosplay Costume Small Shayu
DLiuguangX$9.624.0★
JUOLOET Unisex Adult Onesie Pajamas Shark Animal One Piece Snug Fit Halloween Costume Sleepwear Homewear Shark X-Small
JUOLOET$25.574.6★
Newleafly Unisex Kids Shark Onesie Pajamas Soft Cozy Animal Onesie Halloween Cosplay Costume
Newleafly$24.644.1★
What buyers say about shark boy costume
What buyers praise and complain about, mined from review topics.What buyers love
“The material itself is soft and cozy, and the design is really cute”
“Great gift”
“comfortable”
“Fit well”
“cozy for year round use”
“Good quality”
“Great Buy”
“As advertised”
“Material stays pretty soft”
“Adorable shark design”
What buyers complain about
“Pretty big”
“Ripped the first day”
“not well made”
“the seams were coming apart”
“Arrived with hole”
“Product description was way off”
“The material was very cheap”
“Thin material”
“Also there is NO WAY TO ZIP IT by yourself”
“not great product design”
Top return reasons
Common questions
- Is shark boy costume profitable to sell on Amazon United States?
- The niche generates $0/yr across 36 tracked products. 1 of 4 products launched in the last 360 days are still selling. 90-day search growth is +11.5%. Flapen's verdict: Skip it (44/100).
- How competitive is the shark boy costume niche?
- 23 brands and 28 sellers compete. The top 5 products take 43% of clicks and top 5 brands hold 62% of demand.
- What do buyers complain about in shark boy costume?
- Top complaints mined from reviews: Size-Overall, Durability, Quality-Overall. The return rate is 9.3% — above our launch gate.
- When does demand for shark boy costume peak?
- Demand peaks in Sep–Oct–Nov; the busiest month runs 30.9× the quietest.
- What does it cost to enter the shark boy costume niche?
- Listings span $9.62–$131.79; the average listing price is $34.40 (sweet spot $15–$100). The average incumbent carries 672 reviews — the moat a new listing must climb.