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.

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.

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

Great34%

top-5 click share — an open shelf

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Brand share

Good63%

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

Good1,062.13

avg incumbent reviews — the moat a new listing must climb

Market size

Bad$15K

$15K/yr · 173K searches

Conversion

Bad0.3%

search→purchase rate — share of searches ending in a sale

Returns

Bad11.5%

return rate — above 5% kills the launch gate

Signals Low Review Barrier High Returns Out of Stock

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

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

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.

Peak months: Sep, Oct · busiest ÷ quietest = 42.9×

Open Trend

Top monster costume search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

monster costume55K/yr +45.6%0.1% conv.
monster costume kids26K/yr +32.2%0.1% conv.
monster costume adult19K/yr +44.4%0.3% conv.
monster costumes10K/yr +72.2%0.0% conv.
kids monster costume11K/yr +59.3%0.1% conv.
monster costume women19K/yr +17.5%0.0% conv.
adult monster costume9K/yr +16.0%0.0% conv.
kids monster costumes5K/yr +78.8%0.3% conv.
monster halloween costume7K/yr +85.3%0.0% conv.
womens monster costume6K/yr +42.7%0.0% conv.

All 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.

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

AOLBSPD Big Mouth Monster Onesie Silly Monster Onesie Plush Cosplay Onesie Pajamas Cozy Home Soft Plush Costume(No Shoes Included)-L Purple

AOLBSPD$35.254.1★51 rev

AOLBSPD Big Mouth Monster Onesie Silly Monster Onesie Plush Cosplay Onesie Pajamas Cozy Home Soft Plush Costume(No Shoes Included)-XL Green

AOLBSPD$40.324.1★51 rev

AOLBSPD Big Mouth Monster Onesie Silly Monster Onesie Plush Cosplay Onesie Pajamas Cozy Home Soft Plush Costume(No Shoes Included)-2XL Green

AOLBSPD$36.794.1★51 rev

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$38.644.2★41 rev

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$44.983.8★40 rev

Newest

by launch date

SEHIOZNI Kids Funny Green Monster Onesie Silly Big Mouth Monster Cartoon Soft Plush One Piece (Purple 2-5 Years)

SEHIOZNI$21.7818 rev

1mo ago

VLZLQ 2026 Silly Onesie Funny Green Monster Hooded Fleece Onesie Pajamas Snuggle Monster Onesie for Party & Loungewear (US Alpha Large Regular Regular Green)

VLZLQ$33.254 rev

2mo ago

SEHIOZNI Silly Wearable Onesie Kids Funny Green Monster Jumpsuits Goofy Big Mouth Monster Cartoon Ultra-Soft Plush One Piece Silly Wearable Onesie

SEHIOZNI$22.2818 rev

2mo ago

unicorn paradise Monster Onesie for Animal Pajamas Cosplay Halloween Unisex Costume Without Shoes Blue

unicorn paradise$42.3810 rev

3mo ago

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$38.9041 rev

3mo ago

What reviews say buyers love and hate about monster costume

What buyers praise and complain about, mined from review topics.

What buyers love

Size-Overall21%

“Great fit and match the monster truck”

Comfort-Overall14%

“Very comfortable”

Quality-Overall10%

“Good quality”

Warmth10%

“I love that I can comfortably wear it over regular clothes if I want extra warmth”

Soft Feel10%

“The material feel really soft”

Advertised Vs Actual Product8%

“Made well looks like advertised”

Material Quality4%

“The material is soft, plush, and comfortable, making it perfect for staying cozy on cooler days and nights”

Value For Money4%

“Great deal”

Washability2%

“I love that I can comfortably wear it over regular clothes if I want extra warmth”

Thickness2%

“Just thin enough”

What buyers complain about

Size-Overall28%

“the legs are about 1 foot too short”

Quality-Overall8%

“Not the best quality”

Machine Wash Suitability7%

“balls up after the first wash”

Comfort-Overall4%

“So awkward in the middle”

Product Condition4%

“It came used and covered in leaves and pine straw”

Ease Of Use4%

“can be tricky to line up”

Zipper Quality4%

“Cuffs, size and zippers different”

Transparency3%

“Not see through”

Value For Money3%

“Price high”

Color3%

“The black color wears off after one wash”

Top return reasons

Size-Overall45%

Length16%

Material Quality5%

Advertised Vs Actual Product4%

Quality-Overall3%

Thigh Fit3%

Zipper Quality3%

Product Condition2%

Chest Fit2%

Color1%

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.