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19.5x19.5x1 air filter
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.5%return rate — above 5% kills the launch gate
Conversion
Incredible12.3%search→purchase rate — share of searches ending in a sale
Avg price
Incredible$44.55avg listing price — sweet spot $15–$100
Price range
Incredible$34.04–$53.04cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Good800.33avg incumbent reviews — the moat a new listing must climb
Growth
Good+45.9%90-day search growth — must beat 0% to launch
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
Market size
Bad$80K$80K/yr · 15K searches
Competition
Bad96%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand