Try this one: Books
I usually buy the books that I want to read, but I have bookmarked a number that are on line that I check for quotes or references.

Catch 22 was printed over and over in paperback, very common, $2.00 copies in flea market stalls. Some used dealers, when they buy boxes of books, throw out the older paperbacks (a couple of waste bins here I have checked from time to time) because there is little or no profit in them. Old textbooks always go out the back door.