Buy used psychology textbooks online! Need to save money on your textbooks? Buy used psychology textbooks from Mybookcart! Used textbooks can save you up to 90% on your college books. Buying your textbooks used online is the best way to save money on your college textbooks. Plus, you can get money back when you are finished using your used textbooks by selling them back for cash. Get fast cash for your psychology books by visiting our textbook buyback page.