I'm thinking about buying some textbooks online, but I have a few questions first. 1. What are some good places to buy them from? 2. How long does it usually take to ship? If I'm ordering soon and I won't need them until mid-August, could I get away with just doing normal shipping? 3. Is it easy to sell them back? My college bookstore offers book buy back and I feel like the savings might not be as great if I end up stuck with the book. 4. How often do professors switch the required book? All the books are listed in the bookstore, but I'm worried that they might change it and I'll be stuck with the wrong book and not be able to get the correct one in time. 5. Any tips for buying them? To make this pharmacy related, is this something that I could do once I hopefully enter pharmacy school or is it harder to find those books?