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How do I figure out the market value of used books?
Regarding the textbooks and technical books, it might be worth checking out sites like Chegg.com or other textbook rental websites. They might buy it from you directly versus trying to sell it on an ebay or amazon.  For fiction or nonfiction, amazon and ebay can be tough, but probably worth a look. See what comparables are for your books or similar titles, and if it works, try selling a few. The big problem is that so many sellers are on Amazon these days, that major discounts are commonplace. I've bought hardback 1st editions for less than the cost of economy shipping, so the profit margin is dwindling at best if it's an unpopular or low demand book.