mystery saja boy costume
Skip itSoft demand (-31.8% this quarter) — this niche doesn't clear our bar today.
Review moat
Incredible86.69avg incumbent reviews — the moat a new listing must climb
Avg price
Great$21.84avg listing price — sweet spot $15–$100
Price range
Great$12.17–$34.33cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Good74%top-5 brand share — brands hold most of the demand
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Competition
Okay64%top-5 click share — leaders hold, buyers still browse
Conversion
Bad1.7%search→purchase rate — share of searches ending in a sale
Market size
Bad$53K$53K/yr · 143K searches
Returns
Bad8.9%return rate — above 5% kills the launch gate
Growth
Bad-31.8%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, mystery saja boy costume is a $53K/yr Amazon United States market (143K searches/yr). The top 5 brands hold 74% of demand. Verdict: Skip it — 35/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
mystery saja boy costume market data
- Units sold / yr
- 1K–2K
- avg 0–100/product
- Revenue / yr
- $27K–$33K
- units × avg price
- Conversion rate
- 1.7%
- Avg BSR
- #5,449
- Page quality
- 0%
- Prime
- 75%
- Sponsored
- 50%
- Out of stock
- 25.0%
- Avg brand age
- 28 months
- Avg seller age
- 211 days
Competition & brand share
The top 5 products take 64% of clicks — established leaders, but buyers still shop beyond them.Brands
13
Sellers
14
Top-5 brand share
74%
Top 20: 100%
Top-5 click share
64%
Top 20: 100%
Open market
20%
- Firecos32%
- PUREHAIR12%
- HSIU11%
- Lucoacos10%
- Dreamture9%
- Komar Kids6%
Demand
Weekly Amazon search volume, last 40 weeks — -31.8% search growth over the last 90 days.Top mystery saja boy costume search terms
- mystery saja boy costume71K/yr
- mystery costume13K/yr
- saja boys mystery costume7K/yr
- mystery saja costume6K/yr
- mystery saja boy costume kids18K/yr
- mystery saga costume6K/yr
- saja boys costume mystery6K/yr
- mystery costume kids5K/yr
- saja boys mystery costume kids4K/yr
- saja mystery costume3K/yr
Top mystery saja boy 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.
All 16 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Firecos Mens Anime Cosplay Costume Adults Boys Mystery Cosplay Outfits
Firecos$34.335.0★1 rev
HSIU Mystery Cosplay Wig 30CM gray purple short hair Synthetic Wig Anim Saja Boys Mystery cosplay
HSIU$16.985.0★1 rev
Lucoacos Anime Cosplay Wig Light Purple Mens Short Hair Halloween Party Costume Wigs
Lucoacos$22.394.2★116 rev
Dreamture Kids Knight Costume with Hooded Cloak Medieval Halloween Robe for Boys Girls Black Cosplay Tunic Cape 4-15 Years
Dreamture$16.744.4★43 rev
PUREHAIR Short Blue Purple Cosplay Wig for Men with Long Bangs - Anime Cosplay Wigs for Mens Halloween Costume Party (Blue Purple)
PUREHAIR$19.574.4★88 rev
Newest
by launch date
Kpop Demon Hunter Kids Onesie Pajamas - Boys Girls Long Zip Up Hooded Blanket Sleeper One Piece Costume - Official License
Komar Kids$30.6175 rev
LEMONBABY Little Kids Boys Cool Jacket Sweatshirt Hoodie Coat Costume (PURPLE 5Y)
LEMONBABY$19.78100 rev
LEMONBABY Little Kids Boys Cool Jacket Sweatshirt Hoodie Coat Costume (BLACK 5Y)
LEMONBABY$19.09100 rev
Kpop Demon Hunters Saja Boys Your Idol Mystery T-Shirt
KPop Demon Hunters$18.9313 rev
Firecos Mens Anime Cosplay Costume Adults Boys Mystery Cosplay Outfits
Firecos$34.331 rev
Trending
90-day click momentumLEMONBABY Little Kids Boys Cool Jacket Sweatshirt Hoodie Coat Costume (PURPLE 5Y)
LEMONBABY$19.784.2★
LEMONBABY Little Kids Boys Cool Jacket Sweatshirt Hoodie Coat Costume (BLACK 5Y)
LEMONBABY$19.094.2★
renvena Boys Girls Game Character Outfits Open Front Golden Trim Suit Vest and Satin Harem Pants Set Royal Blue 12 Years
renvena$12.170.0★
Dreamture Kids Knight Costume with Hooded Cloak Medieval Halloween Robe for Boys Girls Black Cosplay Tunic Cape 4-15 Years
Dreamture$16.744.4★
Kpop Demon Hunter Kids Onesie Pajamas - Boys Girls Long Zip Up Hooded Blanket Sleeper One Piece Costume - Official License
Komar Kids$30.614.8★
What buyers say about mystery saja boy costume
What buyers praise and complain about, mined from review topics.What buyers love
“The fabric feels soft and comfortable, perfect for sleeping or lounging around the house”
“the elastic band helped to pull it”
“The onesie is made well”
“this fits her well”
“The design of the pajamas is fun”
“Was durable enough to brush”
“It is light, and looks awesome”
“The color is great”
“it's exactly as pictured”
“The material is soft”
What buyers complain about
“Thin material”
“thin”
“I think the sizes run a little big”
“Thin material”
Top return reasons
Common questions
- Is mystery saja boy costume profitable to sell on Amazon United States?
- The niche generates $53K/yr across 16 tracked products. 1 of 12 products launched in the last 360 days are still selling. 90-day search growth is -31.8%. Flapen's verdict: Skip it (35/100).
- How competitive is the mystery saja boy costume niche?
- 13 brands and 14 sellers compete. The top 5 products take 64% of clicks and top 5 brands hold 74% of demand.
- What do buyers complain about in mystery saja boy costume?
- Top complaints mined from reviews: Material Quality, Thickness, Size-Overall. The return rate is 8.9% — above our launch gate.
- What does it cost to enter the mystery saja boy costume niche?
- Listings span $12.17–$34.33; the average listing price is $21.84 (sweet spot $15–$100). The average incumbent carries 87 reviews — the moat a new listing must climb.