I use Bookfinder.com on a regular basis to find DRM free dead tree books. It searches across all of the big new/used book vendors and also the smaller “thrift store / Goodwill” book dealers (even eBay buy now) Sorts in New and Used groupings then by price.

But like the software “Quality, Cost, Delivery” triangle, the delivery is 99% by USPS media mail, so it’s 5-7 business days to get the book.

It would be interesting to see Bookshop to hookup with Bookfinder to give them another search method.