Certification Book pool?

Does anyone know of a place where people can trade certification books? My thought was that rather than having to buy all of the books for the MCSE for example, I could buy one of the books, say for Exam 70-215 Installing, Configuring, and Administering Microsoft Windows 2000 Server. Rather than buy the book and stash it somewhere when I pass the exam, I could find someone who is needing to take that exam, but has passed a exam that I need to take, and can trade me the book for the exam that they have taken, for the one that I just finished. Just a thought.