How much do you get for selling your college books back to the college bookstore?

I am thinking about selling my college textbooks back to the college bookstore. How much does the college offer you when you sell them your textbooks? Is there a percentage that they usually offer?How much do you get for selling your college books back to the college bookstore?
Personally I avoid the campus bookstore. The campus bookstores screw you twice. They charge too much for the books initially, and then they give you very little back when you sell to them. That's why I now use http://www.bigwords.com for my purchasing and selling back (and also renting if you are so inclined) They are a textbook search engine that searches all the online textbook retailers and rental sites to find you the best prices. And at the end of the semester you can use them to search for resellers to sell your book to. All the search results are organized by price so you can buy your books for the lowest prices and sell them back for the highest.How much do you get for selling your college books back to the college bookstore?
it really depends on the book but you will never get as much as you bought the book for trust me my last day before graduating from college I tried to clear my dorm I took 10 heavy books by hand over to the book store which was blocks away from my dorm (a long walk) do you know the book store only bought back 3 of my books and I only received $25 total and I know when I bought the books I probably paid $25 to $35 a piece for each book I was crushed but I gave the remaining books awayHow much do you get for selling your college books back to the college bookstore?
Each bookstore has their own policy on that. You must ask the bookstore.