How does the “Textbook Buyback” program work?

How does the “Textbook Buyback” program work?
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Answer: 

Buying textbooks back from students helps us to keep a robust selection of used books in stock, and enables us to pay students 50% of a book’s new price if the text will be required by a Oklahoma State course the following semester. Textbook buyback runs for almost two weeks at the end of each semester at several convenient locations on and off campus. We also buy back textbooks at other times of the year, but some of the best prices are paid at the end of each semester.