[ghaff]

>My question is, what happens to the books at the library sale that are unsold there?

The same thing that happens to literally tons of other paper with ink/toner on it. It gets pulped or whatever. I'm not sure how books could have a particular conduit from random item that someone really would prize to that person.

[lucas_membrane]

There are computers, and internet, and book sorting machines with up to 8 output bins, and nobody can afford to put together a book and a person who is willing to pay an hour's wages plus shipping and handling?