Warning: this is photography-adjacent only.
Sometimes I buy second hand books. Either on Amazon or on local markets. Mostly because when you buy a lot of books it becomes expensive. Especially photography books. And I need the money for photography and astronomy. On occasion, these books come from libraries that have closed or that have sold some of their stock of rarely borrowed books to replace them with books people prefer.
I love when these books still contain their date stamped lending cards.
