Most bookstores have an online site..POWELL’S books is a good one..They are liberal but have a good selection of books.....
Being in Portland, they are liberal. However, last I heard they are still selling Andy Ngo’s book Unmasked online.
I have been in their store years ago and loved it. I don’t go to Portland unless I really have to anymore.
Amazon never stocked all of those books that they started out listing.
They took the Books In Print catalog and gave shoppers easy acccess to it. IF they had something in stock they ship it right out, otherwise they would order it for you. Just as any bookstore would do for customers in the 1990s (look it up in Books In Print and they would order it).