---
title: "Boo Costume — $9K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/boo-costume"
last_updated: "2026-08-11T01:51:37.540Z"
locale: en
meta:
description: "Niche score 39/100 · $9K/yr market · 234K searches/yr · $23.03 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 39/100 · $9K/yr market · 234K searches/yr · $23.03 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Boo Costume — $9K/yr Amazon US Niche (2026) - Flapen"
---
# **boo costume**
**Skip it**
A small market ($9K/yr) — this niche doesn't clear our bar today.
Market size 2Growth 31Conversion 2Competition 61Returns 10Price range 83Avg price 95Brand share 63Review moat 60Quality gap 53
**Avg price**
**Incredible****$23.03**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$4.49–$75.03**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****67%**
top-5 brand share — brands hold most of the demand
**Competition**
**Good****48%**
top-5 click share — leaders hold, buyers still browse
**Review moat**
**Good****1,114.69**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Growth**
**Okay****+4.8%**
90-day search growth — must beat 0% to launch
**Returns**
**Bad****9.2%**
return rate — above 5% kills the launch gate
**Market size**
**Bad****$9K**
$9K/yr · 234K 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, boo costume is a $9K/yr Amazon United States market (234K searches/yr). The top 5 brands hold 67% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 39/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **boo costume market data**
- **Units sold / yr**
- **750–1K**
- avg 0–100/product
- **Revenue / yr**
- **$17K–$23K**
- units × avg price
- **Conversion rate**
- **0.2%**
- **Avg BSR**
- **#1,841**
- **Page quality**
- **0%**
- **Prime**
- **81%**
- **Sponsored**
- **73%**
- **Out of stock**
- **11.2%**
- **Avg brand age**
- **33 months**
- **Avg seller age**
- **179 days**
## **Competition & brand share**
The top 5 products take 48% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**17 **▼falling
**Sellers**
**53**
**Top-5 brand share**
**67%**
Top 20: 100%
**Top-5 click share**
**48%**
Top 20: 92%
**Open market**
**27%**
- elope24% - Disney23% - Fun Costumes7% - Bubblopus7% - JenPen6% - MOBJVIY6%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +4.8% search growth over the last 90 days.
50K30KSpike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Sep, Oct · busiest ÷ quietest = 163.3×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/boo-costume/trend)
## **Top boo costume search terms**
- **boo monsters inc costume baby**51K/yr-10.9%0.0% conv. - **baby boo costume**11K/yr+35.5%0.0% conv. - **boo costume monsters inc baby**42K/yr+53.0%0.0% conv. - **monsters inc baby costume**15K/yr+53.0%0.3% conv. - **boo costume baby**15K/yr+13.9%0.0% conv. - **monsters inc costume baby**27K/yr-4.2%0.0% conv. - **monster inc costume baby**14K/yr-8.0%0.0% conv. - **baby boo costume monsters inc**18K/yr-6.1%0.0% conv. - **monsters inc boo costume baby**16K/yr-17.4%0.0% conv. - **baby monsters inc costume**12K/yr-23.7%0.0% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/boo-costume/search-terms)
## **Top boo 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%10%$86120%$2K30%$3K40%$3K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)2 products missing review or click data not plotted
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**elope Disney Monsters Inc Boo Velour Baby Carrier Cover Costume Infant Halloween Costume Character Standard**elope**$40.24**4.5★75 rev](https://www.amazon.com/dp/B0BSLWPX4Q) [2**Infant Disney and Pixar Monster Boo Halloween Costume | Purple Monster Outfit for Babies | Monsters Inc Infant Costume 9/12mo**Fun Costumes**$75.03**4.9★36 rev](https://www.amazon.com/dp/B0DJ7Q5KLF) [3**JenPen 4 Pcs Halloween Cartoon Costume Pink T-Shirt and Purple Leggings White Socks Purple Hair Ties Set for Costume(3t-4t)**JenPen**$28.65**4.6★33 rev](https://www.amazon.com/dp/B0FCFXV4ZX) [4**MOBJVIY Toddler Baby Cute Animal Outfit Hooded Rompers Funny Toddler Halloween Costume Gifts One-piece Outfit (Blue 6-12 Months)**MOBJVIY**$26.15**4.6★101 rev](https://www.amazon.com/dp/B0DFW56LM5) [5**Disney Monsters Inc. Boo Infant Baby Girls Cosplay Bodysuit and Hat Set 12 Months**Disney**$19.70**4.8★8,653 rev](https://www.amazon.com/dp/B0CXW2D9NM)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Bubblopus Baby Halloween Costumes Funny Monster Costume Cute Animal Outfit Halloween Gifts for Infant Toddler Kids (Blue 6-12 Months)**Bubblopus**$24.98**0 rev2mo ago](https://www.amazon.com/dp/B0GXVKKSRJ) [**Bubblopus Baby Halloween Costumes Funny Monster Costume Cute Animal Outfit Halloween Gifts for Infant Toddler Kids (Blue 18-24 Months)**Bubblopus**$24.98**0 rev2mo ago](https://www.amazon.com/dp/B0GXVJ5M16) [**Disney Monsters Inc. Mike Wazowski James P. Sullivan Baby Boys 3 Pack Bodysuit Creeper for Newborn and Infant**Disney**$21.76**5 rev7mo ago](https://www.amazon.com/dp/B0G61BY6NN) [**Disney Monsters Inc. Baby Girls Coverall with Cap 2 Piece Set for Newborn and Infant**Disney**$17.97**16 rev9mo ago](https://www.amazon.com/dp/B0FSNCWKGW) [**Disney Monsters Inc. Baby Girls Coverall with Cap 2 Piece Set for Newborn and Infant**Disney**$18.29**16 rev9mo ago](https://www.amazon.com/dp/B0FSMMF5ZC)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Bubblopus Baby Halloween Costumes Funny Monster Costume Cute Animal Outfit Halloween Gifts for Infant Toddler Kids (Blue 18-24 Months)**Bubblopus**$24.98**0.0★**▲ 706%**](https://www.amazon.com/dp/B0GXVJ5M16) [**Bubblopus Baby Halloween Costumes Funny Monster Costume Cute Animal Outfit Halloween Gifts for Infant Toddler Kids (Blue 6-12 Months)**Bubblopus**$24.98**0.0★**▲ 700%**](https://www.amazon.com/dp/B0GXVKKSRJ) [**Muineobuka My First Halloween Baby Outfit Newborn Long Sleeve Ribbed Romper with Hat Little Boo Halloween Baby Outfits (Apricot 3-6 Months)**Muineobuka**$4.49**2.0★**▲ 682%**](https://www.amazon.com/dp/B0FJXD246W) [**Disney Monsters Inc. Mike Wazowski James P. Sullivan Baby Boys 3 Pack Bodysuit Creeper for Newborn and Infant**Disney**$21.76**5.0★**▲ 672%**](https://www.amazon.com/dp/B0G61BY6NN) [**Disney Monsters Inc. Baby Girls Coverall with Cap 2 Piece Set for Newborn and Infant**Disney**$18.29**3.9★**▲ 671%**](https://www.amazon.com/dp/B0FSMMF5ZC)
**~~View all trending →~~**
## **What buyers say about boo costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**14%
*“Great quality”*
**Size-Overall**12%
*“the onesie fits well”*
**Gifting Purpose**11%
*“Great quality and an excellent gift”*
**Material Quality**8%
*“Super cute and great material”*
**Weight Light**8%
*“Not too bulky”*
**Color**7%
*“very pretty”*
**Zipper Quality**7%
*“Long zipper looks cute”*
**Ease Of Use**7%
*“Easy Costume”*
**Value For Money**5%
*“such a great value”*
**Durability**5%
*“it still held up perfectly”*
### **What buyers complain about **
**Size-Overall**50%
*“Great product and quality i have to return product base it was a little bigger for my baby”*
### **Top return reasons **
**Size-Overall**81%
**Product Condition**3%
**Quality-Overall**2%
**Material Quality**2%
**Ease Of Cleaning**2%
**Chest Fit**2%
**Color**2%
**Advertised Vs Actual Product**2%
**Length**2%
**Gap/Hole**2%
## **Common questions**
- **Is boo costume profitable to sell on Amazon United States?**
- The niche generates $9K/yr across 26 tracked products. 0 of 9 products launched in the last 360 days are still selling. 90-day search growth is +4.8%. Flapen's verdict: Skip it (39/100).
- **How competitive is the boo costume niche?**
- 17 brands and 53 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 67% of demand.
- **What do buyers complain about in boo costume?**
- Top complaints mined from reviews: Size-Overall. The return rate is 9.2% — above our launch gate.
- **When does demand for boo costume peak?**
- Demand peaks in Sep–Oct; the busiest month runs 163.3× the quietest.
- **What does it cost to enter the boo costume niche?**
- Listings span $4.49–$75.03; the average listing price is $23.03 (sweet spot $15–$100). The average incumbent carries 1,115 reviews — the moat a new listing must climb.
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