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knee support
Skip itA small market ($4K/yr) — this niche doesn't clear our bar today.
Avg price
Incredible$28.84avg listing price — sweet spot $15–$100
Price range
Great$13.50–$65.47cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Great4.3★avg incumbent rating — lower means beatable quality
Competition
Good51%top-5 click share — leaders hold, buyers still browse
Returns
Okay3.0%return rate — above 5% kills the launch gate
Growth
Okay+3.6%90-day search growth — must beat 0% to launch
Brand share
Okay88%top-5 brand share — brands hold most of the demand
Review moat
Bad7,485.39avg incumbent reviews — the moat a new listing must climb
Conversion
Bad1.6%search→purchase rate — share of searches ending in a sale
Market size
Bad$4K$4K/yr · 9K searches