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Spanish website Todostuslibros.com did exactly that.[1] It was sponsored by a private association of booksellers, with some public funding (this is a common approach in Europe).

[1] https://www-elconfidencial-com.translate.goog/cultura/2020-0...

Not sure why local bookstores would like to participate in a race to the bottom, though.

Probably because Amazon is already competing with them, and they at least get some independent sales.

This feels like a roundabout way to getting bookshop.org, which might not be the cheapest, but is simple to use as a consumer.