Since forever, college students have done the trade-in dance at the beginning and end of semesters to exchange unwanted textbooks for cash. Usually that cash goes back to the bookstore for the next round of textbooks (or a bit of end-of-semester partying), but it's a tried-and-true way of getting at least a few cents back on your hard-earned dollars. Amazon has just released The Amazon Student app (free) to let you do all of your textbook trading the easy
