---
title: "Stay Puft Marshmallow Man Costume — $8K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/stay-puft-marshmallow-man-costume"
last_updated: "2026-08-10T04:27:22.003Z"
locale: en
meta:
description: "Niche score 46/100 · $8K/yr market · 59K searches/yr · $40.00 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 46/100 · $8K/yr market · 59K searches/yr · $40.00 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Stay Puft Marshmallow Man Costume — $8K/yr Amazon US Niche (2026) - Flapen"
---
# **stay puft marshmallow man costume**
**Skip it**
A small market ($8K/yr) — this niche doesn't clear our bar today.
Market size 2Growth 64Conversion 4Competition 54Returns 4Price range 95Avg price 95Brand share 52Review moat 94Quality gap 75
**Avg price**
**Incredible****$40.00**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$15.03–$96.18**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Great****115.36**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Growth**
**Good****+42.6%**
90-day search growth — must beat 0% to launch
**Competition**
**Good****53%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Good****74%**
top-5 brand share — brands hold most of the demand
**Conversion**
**Bad****0.3%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Bad****10.8%**
return rate — above 5% kills the launch gate
**Market size**
**Bad****$8K**
$8K/yr · 59K searches
**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, stay puft marshmallow man costume is a $8K/yr Amazon United States market (59K searches/yr). The top 5 brands hold 74% of demand. Demand peaks in Sep–Oct. Verdict: Skip it — 46/100.
Data updated Jul 17, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **stay puft marshmallow man costume market data**
- **Units sold / yr**
- **750–1K**
- avg 0–100/product
- **Revenue / yr**
- **$30K–$40K**
- units × avg price
- **Conversion rate**
- **0.3%**
- **Avg BSR**
- **#151,446**
- **Page quality**
- **0%**
- **Prime**
- **43%**
- **Sponsored**
- **71%**
- **Out of stock**
- **3.0%**
- **Avg brand age**
- **52 months**
- **Avg seller age**
- **192 days**
## **Competition & brand share**
The top 5 products take 53% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**12 **▲rising
**Sellers**
**41**
**Top-5 brand share**
**74%**
Top 20: 100%
**Top-5 click share**
**53%**
Top 20: 92%
**Open market**
**18%**
- Mad Engine26% - Disguise16% - Fun Costumes14% - Rubies9% - Ripple Junction8% - Funny Threads Outlet8%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +42.6% search growth over the last 90 days.
25K15KSpike '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Sep, Oct · busiest ÷ quietest = 121.2×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/stay-puft-marshmallow-man-costume/trend)
## **Top stay puft marshmallow man costume search terms**
- **stay puft marshmallow man costume**28K/yr+58.6%0.7% conv. - **marshmallow man costume**8K/yr+35.4%0.6% conv. - **stay puff marshmallow man costume**9K/yr+75.5%1.0% conv. - **stay puft costume**14K/yr+2.7%1.3% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/stay-puft-marshmallow-man-costume/search-terms)
## **Top stay puft marshmallow man 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%5%$40310%$80615%$1K20%$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**Mad Engine Stay Puft Marshmallow Man Costume Adult Ghostbusters Hooded Union Suit Pajama For Men Women (Stay Puft Small/Medium)**Mad Engine**$46.86**4.3★66 rev](https://www.amazon.com/dp/B0DJHJFN9P) [2**Disguise Inflatable Stay Puft Marshmallow Man Costume Official Ghostbusters Afterlife Movie Fan Operated Blow Up Suit One Adult Size (up to 42-46)**Disguise**$80.10**4.5★273 rev](https://www.amazon.com/dp/B07KXYNL8W) [3**Rubies at Party City Ghostbusters: Stay-Puft Marshmallow Man Costume for Adults Unisex No Size**Rubies**$67.72**4.5★1,466 rev](https://www.amazon.com/dp/B00VGT9OOC) [4**Ghostbusters Stay Puft Marshmallow Man Costume for Adults - Unisex Soft Hooded Union Suit Onesie Pajama Jumpsuit S/M**Fun Costumes**$47.94**3.7★23 rev](https://www.amazon.com/dp/B0BKH5GMTG) [5**Stay Puft Marshmallows Funny Old School Ghost Fighting Marshmallow Man 80s 90s Movie Humor Mens Shirt Small Royal**Funny Threads Outlet**$27.87**4.6★85 rev](https://www.amazon.com/dp/B073T65M7D)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Fun Costumes Adult Ghostbusters Stay Puft Marshmallow Man Inflatable Costume | Mens Inflatable Outfit with Headpiece Gloves Standard**Fun Costumes**$43.60**8 rev9mo ago](https://www.amazon.com/dp/B0FSLZP59S) [**Halloween Costume Set with Brown Textured Vest Green Character Ears Headband Nose Piece Adult Size (Brown Green 2XL)**SUPWISER**$20.84**24 rev11mo ago](https://www.amazon.com/dp/B0FN34DV8P) [**Tellingyou 3 Pcs Halloween Giant Colossal Sailor Candy Specter Monster Costume Accessories Sailor Uniform Set Hat Gloves Collar with Tie for Adults Cosplay Party**Tellingyou**$26.41**16 rev11mo ago](https://www.amazon.com/dp/B0FB3VTFFS) [**Mad Engine Ghostbusters Jumpsuit Union Suit Adult Costume One Piece Cosplay Pajama Sleepwear (L/XL)**Mad Engine**$41.02**14 rev1y ago](https://www.amazon.com/dp/B0FDMF678N) [**Mad Engine Stay Puft Marshmallow Man Costume Adult Ghostbusters Hooded Union Suit Pajama For Men Women (Stay Puft Small/Medium)**Mad Engine**$46.86**66 rev1y ago](https://www.amazon.com/dp/B0DJHJFN9P)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Costume Agent Macho Man T-Shirt Bandana and Sunglasses Complete Costume Set (Adult Small) Purple**Costume Agent**$33.72**4.5★**▲ 994%**](https://www.amazon.com/dp/B07Z16RRTW) [**Stay Puft Marshmallows Funny Old School Ghost Fighting Marshmallow Man 80s 90s Movie Humor Mens Shirt Large Royal**Funny Threads Outlet**$27.77**4.6★**▲ 957%**](https://www.amazon.com/dp/B073T6YD3S) [**Halloween Costume Set with Brown Textured Vest Green Character Ears Headband Nose Piece Adult Size (Brown Green 2XL)**SUPWISER**$20.84**3.9★**▲ 945%**](https://www.amazon.com/dp/B0FN34DV8P) [**Stay Puft Marshmallows Funny Old School Ghost Fighting Marshmallow Man 80s 90s Movie Humor Mens Shirt Small Royal**Funny Threads Outlet**$27.87**4.6★**▲ 839%**](https://www.amazon.com/dp/B073T65M7D) [**Ripple Junction Ghostbusters Mens Short Sleeve T-Shirt Stay Puft Marshmallow Man Comedy Movie Costume White XL**Ripple Junction**$15.03**4.4★**▲ 780%**](https://www.amazon.com/dp/B0D747DKCF)
**~~View all trending →~~**
## **What buyers say about stay puft marshmallow man costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**27%
*“Good quality”*
**Size-Overall**23%
*“the fit is perfect”*
**Comfort-Overall**21%
*“comfortable”*
**Advertised Vs Actual Product**8%
*“As described”*
**Value For Money**8%
*“worth the price”*
**Zipper Quality**6%
*“we have had no issues with the zipper”*
### **What buyers complain about **
**Size-Overall**53%
*“large in crotch”*
**Value For Money**8%
*“because I personally feel like the costume is a bit overpriced”*
### **Top return reasons **
**Size-Overall**61%
**Product Condition**10%
**Length**6%
**Functionality-Overall**6%
**Inflation/Deflation**4%
**Arm Fit**3%
**Advertised Vs Actual Product**3%
**Comfort-Overall**3%
**Material Quality**3%
**Ease Of Cleaning**1%
## **Common questions**
- **Is stay puft marshmallow man costume profitable to sell on Amazon United States?**
- The niche generates $8K/yr across 28 tracked products. 0 of 4 products launched in the last 360 days are still selling. 90-day search growth is +42.6%. Flapen's verdict: Skip it (46/100).
- **How competitive is the stay puft marshmallow man costume niche?**
- 12 brands and 41 sellers compete. The top 5 products take 53% of clicks and top 5 brands hold 74% of demand.
- **What do buyers complain about in stay puft marshmallow man costume?**
- Top complaints mined from reviews: Size-Overall, Value For Money. The return rate is 10.8% — above our launch gate.
- **When does demand for stay puft marshmallow man costume peak?**
- Demand peaks in Sep–Oct; the busiest month runs 121.2× the quietest.
- **What does it cost to enter the stay puft marshmallow man costume niche?**
- Listings span $15.03–$96.18; the average listing price is $40.00 (sweet spot $15–$100). The average incumbent carries 115 reviews — the moat a new listing must climb.
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