I got 2 books this way from a book store and they were lightly used books that employees had donated and all the money was being donated to a charity, which I think is a good way to do it.

They're all only $2 or $3 so even if it ends up being one you've already read it's not such a big deal, and you know your money is going to a good cause. And since they're books the employees owned, you know they're probably good!

We used to do that with both books and dvds at our public library. Usually there would be a short description to entice you to choose it! Very fun