Amazon's interface, without the centralization.
I can use a 34" for Amazon, I'm not gonna switch to comparing products on my phone. Especially given that I'm locked so my computer is always nearby.
(Though, of course, the team behind the alternative might be better at resisting the gaming? Google, the company, isn't magic.)
I see this more like an open index of local online stores, curated and not using scrapers/bots to index but by stores submitting their URL and search endpoint for meta-search across all their products. Let the user sort the results by price, location, etc.
Obviously there's always going to be people trying to game the system but it would still be better than what we have now, which is us consumers needing to use Google/DDG/etc to scrape through the 99:1 noise:signal ratio of search results these days just to try fluke upon a local online store that has what we want.
Source: consumer who buys lots online, almost daily, and would absolutely love to support local (national) stores.