---
title: "Rosalina Costume — $101K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/rosalina-costume"
last_updated: "2026-08-10T22:56:37.570Z"
locale: en
meta:
description: "Niche score 56/100 · $101K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 56/100 · $101K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Rosalina Costume — $101K/yr Amazon US Niche (2026) - Flapen"
---
# **rosalina costume**
**Worth a look**
Shows a thin review moat (85 avg reviews), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 25Growth 85Conversion 10Competition 55Returns 38Price range 92Avg price 95Brand share 53Review moat 96Quality gap 65
**Review moat**
**Incredible****84.92**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Incredible****$33.41**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$13.12–$57.95**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Growth**
**Great****+86.2%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Competition**
**Good****52%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Good****73%**
top-5 brand share — brands hold most of the demand
**Returns**
**Okay****4.0%**
return rate — above 5% kills the launch gate
**Market size**
**Okay****$101K**
$101K/yr · 393K searches
**Conversion**
**Bad****0.8%**
search→purchase rate — share of searches ending in a sale
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United States niche tracking, rosalina costume is a $101K/yr Amazon United States market (393K searches/yr). The top 5 brands hold 73% of demand. Demand peaks in Apr–Sep–Oct. Verdict: Worth a look — 56/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **rosalina costume market data**
- **Units sold / yr**
- **3K–3K**
- avg 0–100/product
- **Revenue / yr**
- **$84K–$100K**
- units × avg price
- **Conversion rate**
- **0.8%**
- **Avg BSR**
- **#8,127**
- **Page quality**
- **0%**
- **Prime**
- **81%**
- **Sponsored**
- **77%**
- **Out of stock**
- **14.8%**
- **Avg brand age**
- **34 months**
- **Avg seller age**
- **164 days**
## **Competition & brand share**
The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**17 **▼falling
**Sellers**
**36**
**Top-5 brand share**
**73%**
Top 20: 100%
**Top-5 click share**
**52%**
Top 20: 91%
**Open market**
**22%**
- The Super Mario Galaxy Movie34% - Szytypyl12% - Binbo11% - Mukola9% - Anjite7% - ZIW5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +86.2% search growth over the last 90 days.
20K15KSpike '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, Sep, Oct · busiest ÷ quietest = 17.3×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/rosalina-costume/trend)
## **Top rosalina costume search terms**
- **rosalina costume kids**82K/yr+268.8%0.7% conv. - **rosalina costume**121K/yr+24.7%0.2% conv. - **princess rosalina costume**35K/yr+173.3%0.4% conv. - **rosalina dress**24K/yr+124.0%0.4% conv. - **rosalina cosplay**36K/yr-11.1%0.0% conv. - **princess rosalina dress**7K/yr+172.7%0.3% conv. - **rosalina costume adult**46K/yr+32.6%0.1% conv. - **princess rosalina costume kids**10K/yr+79.8%0.1% conv. - **rosalina costume girls**5K/yr+159.9%0.1% conv. - **rosalina costume women**7K/yr+135.9%0.1% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/rosalina-costume/search-terms)
## **Top rosalina 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%$10K20%$20K30%$30K40%$40K1101001K 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**The Super Mario Galaxy Movie Girls Fantasy Gown Nightgown ROSALINA FANTASY GOWN 3T**The Super Mario Galaxy Movie**$24.01**4.9★34 rev](https://www.amazon.com/dp/B0GLRCTXLP) [2**Binbo Princess Rosalian Costume Dress kids Grils Halloween Cosplay Birthday Party Outfit 5-6Y**Binbo**$35.43**4.8★26 rev](https://www.amazon.com/dp/B0GVDVBBKW) [3**Szytypyl Princess Rosalina Costume for Girls One Shoulder Fancy Dress Gowns with Accessories Green**Szytypyl**$39.60**4.9★27 rev](https://www.amazon.com/dp/B0GW842G8T) [4**Mukola Kids Princess Costume Girls Galaxy Movie Off Shoulder Fancy Dress with Crown Wand Accessories Cosplay Party**Mukola**$35.29**3.9★15 rev](https://www.amazon.com/dp/B0GSZGGG4S) [5**ZIW Princess Rosalina Costume Kids Girls Blue Dress with Wig Wand Crown Earrings Plush Galaxy Princess Outfit for Halloween Party Dress Up ZW264L**ZIW**$39.69**4.5★14 rev](https://www.amazon.com/dp/B0GTMF9X8G)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Anjite Girls Galaxy Princess Rosalina Costume Kids Royal Dress Up with Teal Maxi Dress Wig Crown Wand Earrings for Halloween AJ097L**Anjite**$40.66**8 rev2mo ago](https://www.amazon.com/dp/B0GZWNJZ2N) [**Girls Princess Rosalina Costume Dress with Accessories Blue Princess Dress with Wig Wand Crown Earrings and Star Earrings AJ081M**Anjite**$36.96**3 rev2mo ago](https://www.amazon.com/dp/B0GY89M86X) [**Szytypyl Princess Rosalina Costume for Girls One Shoulder Fancy Dress Gowns with Accessories Green**Szytypyl**$39.60**27 rev3mo ago](https://www.amazon.com/dp/B0GW842G8T) [**Szytypyl Princess Rosalina Costume for Girls One Shoulder Fancy Dress Gowns with Accessories Green**Szytypyl**$38.94**27 rev3mo ago](https://www.amazon.com/dp/B0GW87885M) [**Binbo Grils Princess Rosalian Costume Dress kids Halloween Cosplay Birthday Party Outfit 11-12Y**Binbo**$38.07**3 rev3mo ago](https://www.amazon.com/dp/B0GVJJ3VK8)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Anjite Girls Galaxy Princess Rosalina Costume Kids Royal Dress Up with Teal Maxi Dress Wig Crown Wand Earrings for Halloween AJ097L**Anjite**$40.66**4.7★**▲ 56%**](https://www.amazon.com/dp/B0GZWNJZ2N) [**IDOTTA Girls Princess Costume for Kids Cosplay Fancy Dress up with Crown Magic Wand**IDOTTA**$26.99**2.0★**▲ 56%**](https://www.amazon.com/dp/B0G2PQQK7D) [**CPHDXU Princess Costume Dress for Girls Birthday Halloween Cosplay Dress Up With Crown Earrings Brooch Star Stick Accessories (11Years-12Years)**CPHDXU**$34.29**5.0★**▲ 56%**](https://www.amazon.com/dp/B0GTLGDS2F) [**Szytypyl Princess Rosalina Costume for Girls One Shoulder Fancy Dress Gowns with Accessories Green**Szytypyl**$39.60**4.9★**▲ 56%**](https://www.amazon.com/dp/B0GW842G8T) [**Girls Princess Rosalina Costume Dress with Accessories Blue Princess Dress with Wig Wand Crown Earrings and Star Earrings AJ081M**Anjite**$36.96**4.0★**▲ 56%**](https://www.amazon.com/dp/B0GY89M86X)
**~~View all trending →~~**
## **What buyers say about rosalina costume**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**44%
*“Shirt is of decent quality”*
**Size-Overall**31%
*“It fits perfect”*
**Durability**5%
*“Durable material and very reliable”*
**Material Quality**4%
*“Durable material and very reliable”*
**Value For Money**3%
*“Well worth the money”*
**Soft Feel**2%
*“The dress is silky soft. it's wrinkled in the photo”*
**Ease Of Use**1%
*“It is easy to put on”*
**Print Quality**1%
*“Print quality / design - see photos”*
**Design-Overall**1%
*“I love how they designed this”*
### **What buyers complain about **
**Size-Overall**42%
*“But my grand daughter was so sad that it didnt fit”*
**Brightness/Shine/Glow**18%
*“gets glitter everywhere”*
**Advertised Vs Actual Product**8%
*“Inaccurate picture”*
**Product Condition**5%
*“Size up, this shirt must have been somebody else return, the tag inside is faded”*
**Durability**5%
*“gems fell off easy”*
**Value For Money**5%
*“Waste of time and money”*
**Quality-Overall**3%
*“Very bad quality”*
### **Top return reasons **
**Size-Overall**68%
**Chest Fit**5%
**Advertised Vs Actual Product**5%
**Material Quality**3%
**Value For Money**2%
**Wig/Artificial Hair Quality**2%
**Length**2%
**Quality-Overall**2%
**Stitch/Finish/Polish**2%
**Gap/Hole**2%
## **Common questions**
- **Is rosalina costume profitable to sell on Amazon United States?**
- The niche generates $101K/yr across 26 tracked products. 7 of 18 products launched in the last 360 days are still selling. 90-day search growth is +86.2%. Flapen's verdict: Worth a look (56/100).
- **How competitive is the rosalina costume niche?**
- 17 brands and 36 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 73% of demand.
- **What do buyers complain about in rosalina costume?**
- Top complaints mined from reviews: Size-Overall, Brightness/Shine/Glow, Advertised Vs Actual Product. The return rate is 4.0%.
- **When does demand for rosalina costume peak?**
- Demand peaks in Apr–Sep–Oct; the busiest month runs 17.3× the quietest.
- **What does it cost to enter the rosalina costume niche?**
- Listings span $13.12–$57.95; the average listing price is $33.41 (sweet spot $15–$100). The average incumbent carries 85 reviews — the moat a new listing must climb.
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