---
title: "Barnacle Boy Costume — $41K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/barnacle-boy-costume"
last_updated: "2026-08-09T13:24:17.289Z"
locale: en
meta:
description: "Niche score 35/100 · $41K/yr market · 88K searches/yr · $25.36 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 35/100 · $41K/yr market · 88K searches/yr · $25.36 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Barnacle Boy Costume — $41K/yr Amazon US Niche (2026) - Flapen"
---
# **barnacle boy costume**
**Skip it**
High returns (9.9%) — this niche doesn't clear our bar today.
Market size 10Growth 32Conversion 23Competition 15Returns 7Price range 79Avg price 95Brand share 17Review moat 97Quality gap 81
**Review moat**
**Incredible****55.5**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Incredible****$25.36**
avg listing price — sweet spot $15–$100
**Quality gap**
**Great****4.2★**
avg incumbent rating — lower means beatable quality
**Price range**
**Great****$6.85–$48.66**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Growth**
**Okay****+5.6%**
90-day search growth — must beat 0% to launch
**Conversion**
**Bad****1.8%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Bad****93%**
top-5 brand share — brand-locked demand
**Competition**
**Bad****82%**
top-5 click share — a locked-up shelf
**Market size**
**Bad****$41K**
$41K/yr · 88K searches
**Returns**
**Bad****9.9%**
return rate — above 5% kills the launch gate
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500") [** High Returns**](https://flapen.com/research/niches?market=us&signal=high_returns "Return rate > 5%")
According to Flapen's Amazon United States niche tracking, barnacle boy costume is a $41K/yr Amazon United States market (88K searches/yr). The top 5 brands hold 93% of demand. Demand peaks in Oct–Nov. Verdict: Skip it — 35/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **barnacle boy costume market data**
- **Units sold / yr**
- **3K–4K**
- avg 0–100/product
- **Revenue / yr**
- **$76K–$101K**
- units × avg price
- **Conversion rate**
- **1.8%**
- **Avg BSR**
- **#2,918**
- **Page quality**
- **0%**
- **Prime**
- **90%**
- **Sponsored**
- **60%**
- **Out of stock**
- **32.4%**
- **Avg brand age**
- **34 months**
- **Avg seller age**
- **213 days**
## **Competition & brand share**
The top 5 products capture 82% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**7 **▼falling
**Sellers**
**8**
**Top-5 brand share**
**93%**
Top 20: 100%
**Top-5 click share**
**82%**
Top 20: 100%
**Open market**
**3%**
- Matiniy61% - EchoElce11% - Spirit Halloween8% - JQAKFIY7% - Bgfhna5% - Aniler4% - Open — no brand owns it (1 brand, 3%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +5.6% search growth over the last 90 days.
20K15KSpike '24Spike '25Prime Day '25 seasonSepDecMarJunAugNovMarMay
Peak months: Oct, Nov · busiest ÷ quietest = 41.5×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/barnacle-boy-costume/trend)
## **Top barnacle boy costume search terms**
- **barnacle boy costume**61K/yr+9.3%2.5% conv. - **barnacle boy**7K/yr+2.9%0.7% conv. - **barnacle boy costume women**13K/yr+0.7%1.1% conv. - **barnacle boy costume men**8K/yr-36.8%1.0% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/barnacle-boy-costume/search-terms)
## **Top barnacle 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.
0%15%$6K30%$12K45%$18K60%$25K1101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 10 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Matiniy Halloween Cosplay Accessories Set Include Red Long Sleeves White Hat Blue Gloves Scarf Gloves Black Glasses (L)**Matiniy**$23.99**4.2★16 rev](https://www.amazon.com/dp/B0D8132ZK9) [2**EchoElce 5 PCS Halloween Sailor Costume Accessories Include Sailor Hat Blue Scarf Gloves Socks Eye Mask for Women Men Halloween Party Cosplay**EchoElce**$19.41**3.9★17 rev](https://www.amazon.com/dp/B0DCBSZHT2) [3**Spirit Halloween Adult Spongebob Squarepants Barnacle Boy Costume**Spirit Halloween**$48.66**4.3★100 rev](https://www.amazon.com/dp/B08CLXNTCZ) [4**5 PCS Halloween Sailor Costume Include Sailor Hat Scarf Gloves Socks Glasses for Men Women Cartoon Character Dress Up (Medium) Bluewhite**Matiniy**$18.68**4.4★78 rev](https://www.amazon.com/dp/B0CD1QKYK1) [5**Bgfhna 5 PCS Halloween Sailor Costume Sailor Hat Scarf Gloves Blue Athletic Compression Socks Glasses for Men Women Dress Up**Bgfhna**$15.68**4.5★4 rev](https://www.amazon.com/dp/B0FF433D6S)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Bgfhna 5 PCS Halloween Sailor Costume Sailor Hat Scarf Gloves Blue Athletic Compression Socks Glasses for Men Women Dress Up**Bgfhna**$15.68**4 rev1y ago](https://www.amazon.com/dp/B0FF433D6S) [**JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop M**JQAKFIY**$45.93**6 rev1y ago](https://www.amazon.com/dp/B0FBGP1G4S) [**JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop XL**JQAKFIY**$46.04**6 rev1y ago](https://www.amazon.com/dp/B0FBGNXFGP) [**EchoElce 5 PCS Halloween Sailor Costume Accessories Include Sailor Hat Blue Scarf Gloves Socks Eye Mask for Women Men Halloween Party Cosplay**EchoElce**$19.41**17 rev1y ago](https://www.amazon.com/dp/B0DCBSZHT2) [**Matiniy Halloween Cosplay Accessories Set Include Red Long Sleeves White Hat Blue Gloves Scarf Gloves Black Glasses (L)**Matiniy**$23.99**16 rev2y ago](https://www.amazon.com/dp/B0D8132ZK9)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Matiniy Halloween Cosplay Accessories Set Include Red Long Sleeves White Hat Blue Gloves Scarf Gloves Black Glasses (L)**Matiniy**$23.99**4.2★**▲ 623%**](https://www.amazon.com/dp/B0D8132ZK9) [**Aniler Unisex 18 Elbow Length Full Finger Costume Party Stretchy Gloves (One Size Navy Blue)**Aniler**$9.69**4.4★**▲ 492%**](https://www.amazon.com/dp/B09Y35Y8HJ) [**JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop M**JQAKFIY**$45.93**4.1★**▲ 391%**](https://www.amazon.com/dp/B0FBGP1G4S) [**JQAKFIY Barnacle Boy Costume Mermaid Men Costumes Adult Halloween Character Cosplay Outfit Set with Hat Gloves Scarf Prop XL**JQAKFIY**$46.04**4.1★**▲ 126%**](https://www.amazon.com/dp/B0FBGNXFGP) [**Matiniy 5 PCS Halloween Sailor Costume Include Sailor Hat Scarf Gloves Socks Glasses for Men Women Cartoon Character Dress Up (Large)**Matiniy**$18.67**4.4★**▲ 103%**](https://www.amazon.com/dp/B0CD1RN2P6)
**~~View all trending →~~**
## **What buyers say about barnacle boy costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**33%
*“Good quality”*
### **What buyers complain about **
**Size-Overall**67%
*“Definitely runs tight”*
**Allergies**17%
*“The hat is a little itchy”*
### **Top return reasons **
**Size-Overall**55%
**Waist Fit**6%
**Value For Money**6%
**Product Condition**6%
**Quality-Overall**6%
**Length**3%
**Material Quality**3%
**Gap/Hole**3%
**Smell**3%
**Stretchability/Expandability/Elasticity**3%
## **Common questions**
- **Is barnacle boy costume profitable to sell on Amazon United States?**
- The niche generates $41K/yr across 10 tracked products. 90-day search growth is +5.6%. Flapen's verdict: Skip it (35/100).
- **How competitive is the barnacle boy costume niche?**
- 7 brands and 8 sellers compete. The top 5 products take 82% of clicks and top 5 brands hold 93% of demand.
- **What do buyers complain about in barnacle boy costume?**
- Top complaints mined from reviews: Size-Overall, Allergies. The return rate is 9.9% — above our launch gate.
- **When does demand for barnacle boy costume peak?**
- Demand peaks in Oct–Nov; the busiest month runs 41.5× the quietest.
- **What does it cost to enter the barnacle boy costume niche?**
- Listings span $6.85–$48.66; the average listing price is $25.36 (sweet spot $15–$100). The average incumbent carries 56 reviews — the moat a new listing must climb.
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