---
title: "Saja Boys Costume — £60K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/fashion/saja-boys-costume"
last_updated: "2026-07-31T15:16:46.123Z"
locale: en
meta:
description: "Niche score 38/100 · £60K/yr market · 312K searches/yr · £19.19 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 38/100 · £60K/yr market · 312K searches/yr · £19.19 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Saja Boys Costume — £60K/yr Amazon UK Niche (2026) - Flapen"
---
# **saja boys costume**
**Skip it**
Soft demand (-63.0% this quarter) — this niche doesn't clear our bar today.
Market size 15Growth 0Conversion 13Competition 21Returns 95Price range 76Avg price 85Brand share 18Review moat 88Quality gap 78
**Returns**
**Incredible****1.0%**
return rate — above 5% kills the launch gate
**Review moat**
**Great****237.24**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Great****£19.19**
avg listing price — sweet spot $15–$100
**Quality gap**
**Great****4.3★**
avg incumbent rating — lower means beatable quality
**Price range**
**Great****£8.33–£36.07**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Bad****75%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****93%**
top-5 brand share — brand-locked demand
**Market size**
**Bad****£60K**
£60K/yr · 312K searches
**Conversion**
**Bad****1.0%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Bad****-63.0%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United Kingdom niche tracking, saja boys costume is a £60K/yr Amazon United Kingdom market (312K searches/yr). The top 5 brands hold 93% of demand. Verdict: Skip it — 38/100.
Data updated Jul 23, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **saja boys costume market data**
- **Units sold / yr**
- **1K–1K**
- avg 0–100/product
- **Revenue / yr**
- **£19K–£24K**
- units × avg price
- **Conversion rate**
- **1.0%**
- **Avg BSR**
- **#1,567**
- **Page quality**
- **0%**
- **Prime**
- **88%**
- **Sponsored**
- **71%**
- **Out of stock**
- **33.4%**
- **Avg brand age**
- **37 months**
- **Avg seller age**
- **195 days**
## **Competition & brand share**
The top 5 products capture 75% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**9 **
**Sellers**
**15**
**Top-5 brand share**
**93%**
Top 20: 100%
**Top-5 click share**
**75%**
Top 20: 100%
**Open market**
**5%**
- KPop Demon Hunters36% - Kitimi30% - Metaparty15% - GOLDSTITCH7% - Struts5% - shyhand2% - Open — no brand owns it (3 brands, 5%)
## **Demand**
Weekly Amazon search volume, last 39 weeks — -63.0% search growth over the last 90 days.
25K15KSpike '26Oct '25Dec '25Jan '26Mar '26Apr '26May '26Jul '26
[**Open Trend **](https://flapen.com/research/uk/fashion/saja-boys-costume/trend)
## **Top saja boys costume search terms**
- **saja boys costume**107K/yr-58.6%0.4% conv. - **jinu costume**22K/yr-40.8%0.0% conv. - **jinu kpop demon hunters costume**47K/yr-76.8%0.3% conv. - **k pop demon hunters costume boys**17K/yr-66.1%0.0% conv. - **saja boys costume kids**30K/yr-68.8%0.4% conv. - **kpop demon hunters costume boys**15K/yr-73.7%0.2% conv. - **jinu costume kids**8K/yr-56.5%0.0% conv. - **boys kpop demon hunters costume**5K/yr-64.5%0.0% conv. - **kpop demon hunters saja boys costume**6K/yr-55.5%0.0% conv. - **saja boys costume adult**4K/yr-47.0%0.0% conv. [**All search terms **](https://flapen.com/research/uk/fashion/saja-boys-costume/search-terms)
## **Top saja boys 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%£6K20%£12K30%£18K40%£24K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 17 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**KPop Demon Hunters Official Saja Boys Girls Pyjama Set 5-14 Years 2 Pcs Pjs Shorts & T-shirt Kpop Merch Gifts for Girls (9-10 Years Grey Saja Boys)**KPop Demon Hunters**£14.98**4.6★1,027 rev](https://www.amazon.co.uk/dp/B0FWCXYXMG) [2**Kitimi Jinu Costume Setfor Kid Teen Anime Movie Pop Black Demon Costume with Hat Chains Jewelry Saja Boys Costume Cosplay Outfits for Carnival Christmas Party Stage Dress-Up**Kitimi**£35.30**5.0★3 rev](https://www.amazon.co.uk/dp/B0GCHFPKFR) [3**Metaparty Boys Black Pop Costume World Book Day Costumes for Boys with Jacket Top Pants Hat Accessories for World Book Day (Black 140)**Metaparty**£25.46**3.8★7 rev](https://www.amazon.co.uk/dp/B0G3PGC2C4) [4**Mens Black Vintage Tailcoat Jacket Fancy Cool Cosplay Costume Robe**GOLDSTITCH**£16.16**4.3★1,398 rev](https://www.amazon.co.uk/dp/B09XSXXM9W) [5**Hoodie Kids Boys Kpop Costume- Fasion Pullover Anime Hoodie Kids Costume Hip Hop Streetwear Causal School Warm Oversized Long Sleeve Cartoon Print Hooded Sweatshirt Outwear Saj Merch Unisex 9-10Y**Kitimi**£11.57**4.0★2 rev](https://www.amazon.co.uk/dp/B0GF7VCD4M)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**KPop Demon Hunters Tshirt K Pop Huntrix Girls T-Shirts Short Sleeve Summer Girls Top 9-10 Years Black**KPop Demon Hunters**£13.93**28 rev4mo ago](https://www.amazon.co.uk/dp/B0GRJ51HDG) [**KPop Demon Hunters Tshirt Kpop Girls Tshirt Saja Boys Kids Clothes Short Sleeve Girls T-Shirts Ages 5 to 12 Years White**KPop Demon Hunters**£8.33**20 rev5mo ago](https://www.amazon.co.uk/dp/B0GPRB86F4) [**Kpop Hunters Style Saja Boys Demon Purple Patterns Fake Tattoos**Struts**£9.99**3 rev6mo ago](https://www.amazon.co.uk/dp/B0GG57SCL6) [**Hoodie Kids Boys Kpop Costume- Fasion Pullover Anime Hoodie Kids Costume Hip Hop Streetwear Causal School Warm Oversized Long Sleeve Cartoon Print Hooded Sweatshirt Outwear Saj Merch Unisex 9-10Y**Kitimi**£11.57**2 rev6mo ago](https://www.amazon.co.uk/dp/B0GF7VCD4M) [**Kitimi Jinu Costume Setfor Kid Teen Anime Movie Pop Black Demon Costume with Hat Chains Jewelry Saja Boys Costume Cosplay Outfits for Carnival Christmas Party Stage Dress-Up**Kitimi**£35.30**3 rev7mo ago](https://www.amazon.co.uk/dp/B0GCHFPKFR)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Mens Black Vintage Tailcoat Jacket Fancy Cool Cosplay Costume Robe**GOLDSTITCH**£16.16**4.3★**▲ 140%**](https://www.amazon.co.uk/dp/B09XSXXM9W) [**KPop Demon Hunters Official Saja Boys Girls Pyjama Set 5-14 Years 2 Pcs Pjs Shorts & T-shirt Kpop Merch Gifts for Girls (9-10 Years Grey Saja Boys)**KPop Demon Hunters**£14.98**4.6★**▲ 136%**](https://www.amazon.co.uk/dp/B0FWCXYXMG) [**LOLANTA Unisex Kids Color Block Clothing Set Stylish Street Hip Hop Dance Costume 12-13 Years B-Blue 170**LOLANTA**£28.26**4.4★**▲ 131%**](https://www.amazon.co.uk/dp/B0B7JHTGQ4) [**KPop Demon Hunters Tshirt Kpop Girls Tshirt Saja Boys Kids Clothes Short Sleeve Girls T-Shirts Ages 5 to 12 Years White**KPop Demon Hunters**£8.33**4.9★**▲ 131%**](https://www.amazon.co.uk/dp/B0GPRB86F4) [**KPop Demon Hunters Tshirt K Pop Huntrix Girls T-Shirts Short Sleeve Summer Girls Top 9-10 Years Black**KPop Demon Hunters**£13.93**4.8★**▲ 129%**](https://www.amazon.co.uk/dp/B0GRJ51HDG)
**~~View all trending →~~**
## **What buyers say about saja boys costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**47%
*“great quality costume”*
**Size-Overall**47%
*“fit my child perfect”*
**Value For Money**7%
*“is good value for money”*
### **What buyers complain about **
**Material Quality**50%
*“it is very very cheap material”*
**Value For Money**17%
*“Cheap”*
**Quality-Overall**11%
*“Poor quality”*
**Strength**11%
*“flimsy red ribbon”*
**Stitch/Finish/Polish**11%
*“its basically fabric stitched into this shape”*
### **Top return reasons **
**Size-Overall**93%
**Quality-Overall**2%
**Gap/Hole**2%
**Product Condition**2%
**Smell**1%
**Advertised Vs Actual Product**1%
## **Common questions**
- **Is saja boys costume profitable to sell on Amazon United Kingdom?**
- The niche generates £60K/yr across 17 tracked products. 0 of 13 products launched in the last 360 days are still selling. 90-day search growth is -63.0%. Flapen's verdict: Skip it (38/100).
- **How competitive is the saja boys costume niche?**
- 9 brands and 15 sellers compete. The top 5 products take 75% of clicks and top 5 brands hold 93% of demand.
- **What do buyers complain about in saja boys costume?**
- Top complaints mined from reviews: Material Quality, Value For Money, Quality-Overall. The return rate is 1.0%.
- **What does it cost to enter the saja boys costume niche?**
- Listings span £8.33–£36.07; the average listing price is £19.19 (sweet spot $15–$100). The average incumbent carries 237 reviews — the moat a new listing must climb.
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