---
title: "Boys Halloween Costumes Size 10-12 — $30K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/boys-halloween-costumes-size-10-12"
last_updated: "2026-08-10T21:06:19.703Z"
locale: en
meta:
description: "Niche score 29/100 · $30K/yr market · 666K searches/yr · $26.67 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 29/100 · $30K/yr market · 666K searches/yr · $26.67 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Boys Halloween Costumes Size 10-12 — $30K/yr Amazon US Niche (2026) - Flapen"
---
# **boys halloween costumes size 10-12**
**Skip it**
Weak search conversion (0.2%) — this niche doesn't clear our bar today.
Market size 8Growth 17Conversion 2Competition 20Returns 20Price range 72Avg price 95Brand share 44Review moat 54Quality gap 48
**Avg price**
**Incredible****$26.67**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$6.54–$36.83**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Good****1,333.54**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Okay****79%**
top-5 brand share — brands hold most of the demand
**Competition**
**Bad****76%**
top-5 click share — a locked-up shelf
**Returns**
**Bad****6.5%**
return rate — above 5% kills the launch gate
**Growth**
**Bad****-15.1%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$30K**
$30K/yr · 666K searches
**Conversion**
**Bad****0.2%**
search→purchase rate — share of searches ending in a sale
**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, boys halloween costumes size 10-12 is a $30K/yr Amazon United States market (666K searches/yr). The top 5 brands hold 79% of demand. Demand peaks in Sep–Oct–Nov. Verdict: Skip it — 29/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **boys halloween costumes size 10-12 market data**
- **Units sold / yr**
- **4K–5K**
- avg 0–100/product
- **Revenue / yr**
- **$107K–$133K**
- units × avg price
- **Conversion rate**
- **0.2%**
- **Avg BSR**
- **#1,480**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **85%**
- **Out of stock**
- **14.7%**
- **Avg brand age**
- **40 months**
- **Avg seller age**
- **173 days**
## **Competition & brand share**
The top 5 products capture 76% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**12 **▲rising
**Sellers**
**15**
**Top-5 brand share**
**79%**
Top 20: 100%
**Top-5 click share**
**76%**
Top 20: 100%
**Open market**
**17%**
- mcuaeddu35% - inkArts16% - GLEDLOVES13% - Nabobs9% - NewPlush5% - Slendor4% - Open — no brand owns it (6 brands, 17%)
## **Demand & seasonality**
Weekly Amazon search volume, last 88 weeks — -15.1% search growth over the last 90 days.
150K100KSpike '25Prime Day '25Spike '26 seasonDecJanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Sep, Oct, Nov · busiest ÷ quietest = 319.3×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/boys-halloween-costumes-size-10-12/trend)
## **Top boys halloween costumes size 10-12 search terms**
- **costumes for kids 10-12**22K/yr+16.4%0.1% conv. - **costumes for boys 8-10**20K/yr-37.2%0.2% conv. - **boys halloween costumes size 10-12**115K/yr+200.0%0.2% conv. - **boy costumes 10-12**46K/yr-47.4%0.0% conv. - **teen boy halloween costumes**119K/yr+18.9%0.0% conv. - **boy costumes 8-10**16K/yr-32.6%0.0% conv. - **costume for kids 10-12**13K/yr-50.1%0.0% conv. - **kids halloween costumes boys 8-10**27K/yr+75.3%0.0% conv. - **halloween costumes boys 10-12**32K/yr+90.7%0.0% conv. - **kids costumes for boys 8-10**7K/yr-31.1%0.0% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/boys-halloween-costumes-size-10-12/search-terms)
## **Top boys halloween costumes size 10-12 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%10%$3K20%$6K30%$9K40%$12K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 13 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**mcuaeddu Demogorgon Onesie Halloween Costume Costume Warm Long Sleeve Costume (10-12 Years)**mcuaeddu**$36.83**4.6★169 rev](https://www.amazon.com/dp/B0GJNSYXH2) [2**inkArts Shark Blanket Hoodie - Adult Shark Sleeping Bag & Cozy Flannel Hoodie**inkArts**$20.13**4.2★4,873 rev](https://www.amazon.com/dp/B0CH9TWC91) [3**GLEDLOVES LED Gloves for Kids Teens & Adults - Finger Light Gloves with 5 Colors/6 Modes - Perfect for 9-12 Year Old Boys & Girls - Ideal for Halloween & Christmas Parties**GLEDLOVES**$6.54**4.4★3,170 rev](https://www.amazon.com/dp/B08ZHMZXVS) [4**Nabobs Unisex Animal Onesie Costume Flannel Halloween Cosplay Costume - Homewear Animal Outfit**Nabobs**$15.29**4.7★76 rev](https://www.amazon.com/dp/B0FT7K6BKR) [5**NewPlush Unisex Children Unicorn Pyjamas Halloween Kids Onesie Costume (10-12 Years 01Starry Star 10_years)**NewPlush**$22.59**4.5★2,146 rev](https://www.amazon.com/dp/B094FF8ML6)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Mistletoe unicorn Kids Flannel demogorgon Onesie Pajamas Black**Mistletoe unicorn**$29.78**75 rev3mo ago](https://www.amazon.com/dp/B0GSJWGV7R) [**mcuaeddu Demogorgon Onesie Halloween Costume Costume Warm Long Sleeve Costume (10-12 Years)**mcuaeddu**$36.83**169 rev5mo ago](https://www.amazon.com/dp/B0GJNSYXH2) [**mcuaeddu Demogorgon Onesie Halloween Costume Costume Warm Long Sleeve Costume (8-10 Years)**mcuaeddu**$36.55**169 rev5mo ago](https://www.amazon.com/dp/B0GJNRGK4C) [**Nabobs Unisex Animal Onesie Costume Flannel Halloween Cosplay Costume - Homewear Animal Outfit**Nabobs**$15.29**76 rev9mo ago](https://www.amazon.com/dp/B0FT7K6BKR) [**Corespe Kids Dragon Costume Set with Tail and Mask Boys Halloween Dragon Cosplay Dress Up Outfits (Blue Medium(8-10 Years))**Corespe**$31.60**116 rev11mo ago](https://www.amazon.com/dp/B0FLDL4YM4)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Mistletoe unicorn Kids Flannel demogorgon Onesie Pajamas Black**Mistletoe unicorn**$29.78**4.5★**▲ 1000%**](https://www.amazon.com/dp/B0GSJWGV7R) [**Nabobs Unisex Animal Onesie Costume Flannel Halloween Cosplay Costume - Homewear Animal Outfit**Nabobs**$15.29**4.7★**▲ 1000%**](https://www.amazon.com/dp/B0FT7K6BKR) [**mcuaeddu Demogorgon Onesie Halloween Costume Costume Warm Long Sleeve Costume (8-10 Years)**mcuaeddu**$36.55**4.6★**▲ 1000%**](https://www.amazon.com/dp/B0GJNRGK4C) [**mcuaeddu Demogorgon Onesie Halloween Costume Costume Warm Long Sleeve Costume (10-12 Years)**mcuaeddu**$36.83**4.6★**▲ 1000%**](https://www.amazon.com/dp/B0GJNSYXH2) [**NewPlush Unisex Children Unicorn Pyjamas Halloween Kids Onesie Costume (10-12 Years 01Starry Star 10_years)**NewPlush**$22.59**4.5★**▲ 854%**](https://www.amazon.com/dp/B094FF8ML6)
**~~View all trending →~~**
## **What buyers say about boys halloween costumes size 10-12**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Gifting Purpose**15%
*“Amazing gift”*
**Fun/Entertainment Experience**14%
*“Great fun”*
**Comfort-Overall**8%
*“comfortable to wear”*
**Quality-Overall**8%
*“Good quality”*
**Soft Feel**7%
*“Very soft”*
**Advertised Vs Actual Product**6%
*“As described”*
**Size-Overall**5%
*“The size I bought fit perfectly”*
**Value For Money**5%
*“Great buy”*
**Color**4%
*“relatively bright colors”*
**Ease Of Use**4%
*“Easy to use”*
### **What buyers complain about **
**Size-Overall**28%
*“Too small”*
**Durability**15%
*“Broke Immediately”*
**Quality-Overall**15%
*“not well made”*
**Stitch/Finish/Polish**4%
*“Seams are trash”*
**Gap/Hole**4%
*“Arrived with hole”*
**Material Quality**3%
*“The material was very cheap”*
**Strap/String Quality**2%
*“The onesie also had strings of thread hanging loose that I had to cut”*
**Value For Money**2%
*“Paid way more than I thought”*
**Advertised Vs Actual Product**2%
*“This was nothing like the picture”*
**Smell**2%
*“Battery make it smelly”*
### **Top return reasons **
**Size-Overall**55%
**Length**13%
**Gap/Hole**4%
**Advertised Vs Actual Product**4%
**Functionality-Overall**3%
**Material Quality**2%
**Sleeve Fit**2%
**Stitch/Finish/Polish**2%
**Shoulder Fit**1%
**Arm Fit**1%
## **Common questions**
- **Is boys halloween costumes size 10-12 profitable to sell on Amazon United States?**
- The niche generates $30K/yr across 13 tracked products. 0 of 5 products launched in the last 360 days are still selling. 90-day search growth is -15.1%. Flapen's verdict: Skip it (29/100).
- **How competitive is the boys halloween costumes size 10-12 niche?**
- 12 brands and 15 sellers compete. The top 5 products take 76% of clicks and top 5 brands hold 79% of demand.
- **What do buyers complain about in boys halloween costumes size 10-12?**
- Top complaints mined from reviews: Size-Overall, Durability, Quality-Overall. The return rate is 6.5% — above our launch gate.
- **When does demand for boys halloween costumes size 10-12 peak?**
- Demand peaks in Sep–Oct–Nov; the busiest month runs 319.3× the quietest.
- **What does it cost to enter the boys halloween costumes size 10-12 niche?**
- Listings span $6.54–$36.83; the average listing price is $26.67 (sweet spot $15–$100). The average incumbent carries 1,334 reviews — the moat a new listing must climb.
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