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john cena costume

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A small market ($27K/yr) — this niche doesn't clear our bar today.

Market size 7Growth 24Conversion 11Competition 57Returns 44Price range 84Avg price 95Brand share 51Review moat 35Quality gap 37

Avg price

Incredible$26.97

avg listing price — sweet spot $15–$100

Price range

Great$6.79–$64.38

cheapest to priciest tracked listing — scored on the share inside $15–$100

Competition

Good51%

top-5 click share — leaders hold, buyers still browse

Brand share

Good75%

top-5 brand share — brands hold most of the demand

Returns

Okay3.8%

return rate — above 6% kills the launch gate

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Review moat

Okay2,990.36

avg incumbent reviews — the moat a new listing must climb

Growth

Bad-1.5%

90-day search growth — must beat 0% to launch

Conversion

Bad0.9%

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

Market size

Bad$27K

$27K/yr · 109K searches

Competition

The top 5 products take 51% of clicks — established leaders, but buyers still shop beyond them.

Brands

17 falling

Sellers

64

Top-5 brand share

75%

Open market

22%

  • ONUPGO31%
  • Suddora14%
  • Fifth Sun13%
  • Morph9%
  • Seaehey8%
  • Costume Agent3%

Product shelf

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%4%$1K8%$2K12%$3K16%$4K1101001K10K100K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 28 tracked products in this niche — three views at once, no toggling.

Demand

Weekly Amazon search volume, last 36 weeks — -1.5% search growth over the last 90 days.
10K6KHoliday '25Spike '26Nov '25Dec '25Jan '26Mar '26Apr '26May '26

Reviews

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

What buyers love

Size-Overall20%

“perfect fit”

Quality-Overall17%

“Good quality”

Advertised Vs Actual Product13%

“Just as described”

Fun/Entertainment Experience10%

“Great toy”

Value For Money10%

“Worth the buy”

Gifting Purpose9%

“My son absolutely loves the gift”

Stretchability/Expandability/Elasticity3%

“Firm elastic hold”

Thickness3%

“thin enough that it doesn't feel like you're playing with a cast on, etc”

Comfort-Overall2%

“They're very comfortable”

Material Quality2%

“good materials”

What buyers complain about

Quality-Overall14%

“The quality was bad and the headband and wrist bands are so small”

Durability14%

“Came apart”

Size-Overall10%

“Super small”

Sweat Resistance6%

“absorb less sweat compared to cotton”

Material Quality6%

“See threw cheap material”

Ease Of Use6%

“Unable to use more than once”

Thin6%

“Thin”

Strength6%

“Flimsy”

Ease Of Cleaning3%

“These don't hold up well to cleaning so they wear out pretty quick”

Add-Ons/Attachments3%

“Belt was not even attached to the packaging and was creased”

Top return reasons

Size-Overall47%
Wrist Fit13%
Color6%
Value For Money5%
Quality-Overall4%
Length4%
Advertised Vs Actual Product3%
Material Quality3%
Functionality-Overall2%
Product Condition2%