Don't buy textbooks at the campus bookstore, unless you plan on spending way more than you have to. Try websites like www.chegg.com and www.slugbooks.com, where you can compare prices from various online sellers. Just remember, if you are ordering online, leave 2-3 weeks for delivery. You can also try buying books from other people at your school. Some schools have Facebook groups for this. If your school doesn't have one, try creating one! Other students will thank you when they are able to buy and sell textbooks at good prices.