---
title: "Monster Costume — $1K/mo Amazon US Product Research (2026)"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/monster-costume"
last_updated: "2026-08-12T06:26:14.326Z"
locale: en
meta:
description: "Amazon product research for monster costume: $1K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for monster costume: $1K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Monster Costume — $1K/mo Amazon US Product Research (2026)"
---
# **Monster Costume**
**Worth a look**
Shows a sweet-spot price point ($32.44 avg), but high returns (11.5%) keeps it on the watch list.
Market size 4Growth 65Conversion 3Competition 81Returns 2Price range 95Avg price 95Brand share 70Review moat 61Quality gap 76
**Avg price**
**Incredible****$32.44**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$16.30–$44.98**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Great****34%**
top-5 click share — an open shelf
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Good****63%**
top-5 brand share — brands hold most of the demand
**Growth**
**Good****+44.8%**
90-day search growth — must beat 0% to launch
**Review moat**
**Good****1,062.13**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Bad****$15K**
$15K/yr · 173K searches
**Conversion**
**Bad****0.3%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Bad****11.5%**
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%") [** Out of Stock**](https://flapen.com/research/niches?market=us&signal=out_of_stock "OOS rate > 10%")
## **Is monster costume profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, monster costume is a $15K/yr Amazon United States market (173K searches/yr). The top 5 brands hold 63% of demand. Demand peaks in Sep–Oct. Verdict: Worth a look — 50/100.
Data updated Jul 21, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **monster costume market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **500–750**
- avg 0–100/product
- **Revenue / yr**
- **$16K–$24K**
- units × avg price
- **Conversion rate**
- **0.3%**
- **Avg BSR**
- **#34,420**
- **Page quality**
- **0%**
- **Prime**
- **61%**
- **Sponsored**
- **91%**
- **Out of stock**
- **17.0%**
- **Avg brand age**
- **36 months**
- **Avg seller age**
- **178 days**
## **Competition: brands, sellers & click share**
Clicks spread well past the top 5 (34% combined) — an open shelf where new products get seen.
**Brands**
**26 **▼falling
**Sellers**
**42**
**Top-5 brand share**
**63%**
Top 20: 97%
**Top-5 click share**
**34%**
Top 20: 69%
**Open market**
**30%**
- AOLBSPD25% - Brrioe15% - Generic8% - SEHIOZNI8% - JVZJVZ8% - COSUSKET7%
## **monster costume demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +44.8% search growth over the last 90 days.
25K15KSpike '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Sep, Oct · busiest ÷ quietest = 42.9×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/monster-costume/trend)
## **Top monster costume search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **monster costume**55K/yr+45.6%0.1% conv. - **monster costume kids**26K/yr+32.2%0.1% conv. - **monster costume adult**19K/yr+44.4%0.3% conv. - **monster costumes**10K/yr+72.2%0.0% conv. - **kids monster costume**11K/yr+59.3%0.1% conv. - **monster costume women**19K/yr+17.5%0.0% conv. - **adult monster costume**9K/yr+16.0%0.0% conv. - **kids monster costumes**5K/yr+78.8%0.3% conv. - **monster halloween costume**7K/yr+85.3%0.0% conv. - **womens monster costume**6K/yr+42.7%0.0% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/monster-costume/search-terms)
## **Top monster costume products & what they sell for**
Every tracked product — its share of the shelf, its review moat, and what it sells for.
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%3%$4546%$9079%$1K12%$2K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**AOLBSPD Big Mouth Monster Onesie Silly Monster Onesie Plush Cosplay Onesie Pajamas Cozy Home Soft Plush Costume(No Shoes Included)-L Purple**AOLBSPD**$35.25**4.1★51 rev](https://www.amazon.com/dp/B0GTL5V421) [2**AOLBSPD Big Mouth Monster Onesie Silly Monster Onesie Plush Cosplay Onesie Pajamas Cozy Home Soft Plush Costume(No Shoes Included)-XL Green**AOLBSPD**$40.32**4.1★51 rev](https://www.amazon.com/dp/B0GTL1KNHN) [3**AOLBSPD Big Mouth Monster Onesie Silly Monster Onesie Plush Cosplay Onesie Pajamas Cozy Home Soft Plush Costume(No Shoes Included)-2XL Green**AOLBSPD**$36.79**4.1★51 rev](https://www.amazon.com/dp/B0GZZSHVHK) [4**Brrioe Funny Big Mouth Monster Onesie Pajamas with Large Comb Oversized Plush Fleece Hooded One Piece for Sleep & Party (US Alpha Medium Regular Regular Red)**Brrioe**$38.64**4.2★41 rev](https://www.amazon.com/dp/B0GRVCB8TZ) [5**xfcyzlgl Goofy aldult Onesie Pajamas - Big Mouth Monster Onesie Coral Fleece Couple Loungewear Pajama Party & Cozy Sleepwear Gift (US Alpha X-Large Regular Regular Green)**xfcyzlgl**$44.98**3.8★40 rev](https://www.amazon.com/dp/B0GVN4C1P1)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**SEHIOZNI Kids Funny Green Monster Onesie Silly Big Mouth Monster Cartoon Soft Plush One Piece (Purple 2-5 Years)**SEHIOZNI**$21.78**18 rev1mo ago](https://www.amazon.com/dp/B0H3D6MN7D) [**VLZLQ 2026 Silly Onesie Funny Green Monster Hooded Fleece Onesie Pajamas Snuggle Monster Onesie for Party & Loungewear (US Alpha Large Regular Regular Green)**VLZLQ**$33.25**4 rev2mo ago](https://www.amazon.com/dp/B0H2L5WMZM) [**SEHIOZNI Silly Wearable Onesie Kids Funny Green Monster Jumpsuits Goofy Big Mouth Monster Cartoon Ultra-Soft Plush One Piece Silly Wearable Onesie**SEHIOZNI**$22.28**18 rev2mo ago](https://www.amazon.com/dp/B0GYYZKR1M) [**unicorn paradise Monster Onesie for Animal Pajamas Cosplay Halloween Unisex Costume Without Shoes Blue**unicorn paradise**$42.38**10 rev3mo ago](https://www.amazon.com/dp/B0GVQ4PT26) [**Brrioe Funny Big Mouth Monster Onesie Pajamas with Large Comb Oversized Plush Fleece Hooded One Piece for Sleep & Party (US Alpha Large Regular Regular Aqua green)**Brrioe**$38.90**41 rev3mo ago](https://www.amazon.com/dp/B0GVJD3KH3)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Brrioe Funny Big Mouth Monster Onesie Pajamas with Large Comb Oversized Plush Fleece Hooded One Piece for Sleep & Party (US Alpha Large Regular Regular Orange)**Brrioe**$38.53**4.2★**▲ 44%**](https://www.amazon.com/dp/B0GRV8XQRK) [**Brrioe Funny Big Mouth Monster Onesie Pajamas with Large Comb Oversized Plush Fleece Hooded One Piece for Sleep & Party (US Alpha Large Regular Regular Aqua green)**Brrioe**$38.90**4.2★**▲ 44%**](https://www.amazon.com/dp/B0GVJD3KH3) [**SEHIOZNI Silly Wearable Onesie Kids Funny Green Monster Jumpsuits Goofy Big Mouth Monster Cartoon Ultra-Soft Plush One Piece Silly Wearable Onesie**SEHIOZNI**$22.28**4.2★**▲ 44%**](https://www.amazon.com/dp/B0GYYZKR1M) [**unicorn paradise Monster Onesie for Animal Pajamas Cosplay Halloween Unisex Costume Without Shoes Blue**unicorn paradise**$42.38**3.8★**▲ 44%**](https://www.amazon.com/dp/B0GVQ4PT26) [**JVZJVZ Big mouth monster onesie monster onesie warm home loungewear plush pajamas funny pajamas (US Alpha X-Large Regular Regular Purple)**JVZJVZ**$38.69**3.7★**▲ 44%**](https://www.amazon.com/dp/B0GVFMZHRY)
**~~View all trending →~~**
## **What reviews say buyers love and hate about monster costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**21%
*“Great fit and match the monster truck”*
**Comfort-Overall**14%
*“Very comfortable”*
**Quality-Overall**10%
*“Good quality”*
**Warmth**10%
*“I love that I can comfortably wear it over regular clothes if I want extra warmth”*
**Soft Feel**10%
*“The material feel really soft”*
**Advertised Vs Actual Product**8%
*“Made well looks like advertised”*
**Material Quality**4%
*“The material is soft, plush, and comfortable, making it perfect for staying cozy on cooler days and nights”*
**Value For Money**4%
*“Great deal”*
**Washability**2%
*“I love that I can comfortably wear it over regular clothes if I want extra warmth”*
**Thickness**2%
*“Just thin enough”*
### **What buyers complain about **
**Size-Overall**28%
*“the legs are about 1 foot too short”*
**Quality-Overall**8%
*“Not the best quality”*
**Machine Wash Suitability**7%
*“balls up after the first wash”*
**Comfort-Overall**4%
*“So awkward in the middle”*
**Product Condition**4%
*“It came used and covered in leaves and pine straw”*
**Ease Of Use**4%
*“can be tricky to line up”*
**Zipper Quality**4%
*“Cuffs, size and zippers different”*
**Transparency**3%
*“Not see through”*
**Value For Money**3%
*“Price high”*
**Color**3%
*“The black color wears off after one wash”*
### **Top return reasons **
**Size-Overall**45%
**Length**16%
**Material Quality**5%
**Advertised Vs Actual Product**4%
**Quality-Overall**3%
**Thigh Fit**3%
**Zipper Quality**3%
**Product Condition**2%
**Chest Fit**2%
**Color**1%
## **Common monster costume questions**
- **Is monster costume profitable to sell on Amazon United States?**
- The niche generates $15K/yr across 56 tracked products. 16 of 37 products launched in the last 360 days are still selling. 90-day search growth is +44.8%. Flapen's verdict: Worth a look (50/100).
- **How competitive is the monster costume niche?**
- 26 brands and 42 sellers compete. The top 5 products take 34% of clicks and top 5 brands hold 63% of demand.
- **What do buyers complain about in monster costume?**
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Machine Wash Suitability. The return rate is 11.5% — above our launch gate.
- **When does demand for monster costume peak?**
- Demand peaks in Sep–Oct; the busiest month runs 42.9× the quietest.
- **What does it cost to enter the monster costume niche?**
- Listings span $16.30–$44.98; the average listing price is $32.44 (sweet spot $15–$100). The average incumbent carries 1,062 reviews — the moat a new listing must climb.
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