I just took a crapton of books to Half Priced Books and they only gave me $28. I feel used.
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If you're talking text books - you need to be selling that stuff on your own, via ebay or amazon or half.com - whichever has the best price... and if your school uses some outdated version that's only good for your school, use the school BBs. :)

However, I did get a one year old writer's market. I need at least try to get some clippings.