40
4 inch carbon filter
Skip itA small market ($55K/yr) — this niche doesn't clear our bar today.
Avg price
Incredible$39.03avg listing price — sweet spot $15–$100
Price range
Incredible$16.06–$89.42cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Good6.5%search→purchase rate — share of searches ending in a sale
Returns
Good2.4%return rate — above 5% kills the launch gate
Review moat
Okay2,023.07avg incumbent reviews — the moat a new listing must climb
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Brand share
Okay90%top-5 brand share — brands hold most of the demand
Competition
Bad73%top-5 click share — a locked-up shelf
Growth
Bad-12.1%90-day search growth — must beat 0% to launch
Market size
Bad$55K$55K/yr · 22K searches