In the town where I live, surplus books from the library, and donated books, are sold twice a year over several weekends. As time goes on at these events the price drops, until on the last day it's $1 for a paper grocery bag full. Those that remain go into a dumpster for pulping and recycling.

It's quite an event with long lines to get in and is loved by all. The money raised is used to buy more books for the library.

https://booksale.org/