There are lots of used book stores that would buy your books for various
amounts of cash. The used book market is surprisingly large, and
widespread (your books might be resold in Scandanavia.)
In college, at the end of the semester, I would go through the trash and
pick up textbooks. I would sell them for either credit or cash, and I
financed most of my library like that.
If one bookstore turns a book down, than try another.
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