Collect some cash when you sell your textbooks back to the Tivoli Station.A valid student ID is required for all buyback transactions.FAQSWhen can I sell back my textbooks?We buy back books all year round, but the best time to sell back books is at the end of each semester.Where can I sell back my textbooks?Our buyback takes place at the lower level cash registers. During peak times it is located outside the Tivoli Station on the first floor of the Tivoli Student Union behind Subway and Alfresco Greens. During slower times of the semester, buyback is located inside of the store at the CU Denver registers.Can I sell back my textbooks online?We do offer online buyback through a third party affiliate. Prices will vary from in-store buyback. To sell back your books online, visit our online buyback page.