Another solution is trying companies buying old media. I finally got rid of Lisp in Small Pieces, which I would never have worked through anyway and some other comparable book I cannot remember for double-digit Euros!

It's hit-and-miss, though. I see no rhyme and reason in which books they're interested in, and the prices.

Just the day before yesterday I took some cooking books in pristine condition to the library. They used to have a book-swapping box outside. It was gone.

I went in (not too thrilled with the prospect of lugging it all back home) and asked about it. No, they don't have it anymore. I can put my books in the "free section" inside.

I did that, the librarian walked by to take a look and snatched the books away. "They are good, I'll see whether we can use them for the library. Usually we only get books we throw away immediately."