The last time I was in, they credited to your account 1/2 the cover price of the books in trade value. On occasion they may pay cash for certain books. If you have enough credit on your account then used books are $.50 each.
If you take books in to trade and you have enough of them you only pay a transaction fee which is very low. They give you like half price for your books and charge you full price for what you take out.
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