Better World Books
Questions & Answers

It's a non-profit run by volunteers at several sites around the U.S. Many of their books are from public libraries & in good condition often. They also get donations from the public & some of those are in only Fair or Good condition, though lots are in Very Good/Like New or New condition.
My favorite thing about BWB is their free book donations to very poor countries!
I've bought from BWB for over 4 years & have bought close to a 100 books. Great non-profit!

Yes. Email me a financial statement for betterworldbooks.