SocialBib is essentially a book trading system so students get their books for only the modest cost of shipping. For those more esoteric book lists this may not be the thing, but for those Chem and Calculus books ever so common (and expensive) this looks like the perfect answer!
The site is free to use and sign-up for. You simply list the books you have to give and the books you need, and SocialBib works out the details. It even has a Facebook application! I really wish such services were available when I was taking gen-ed courses.
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