Finding out what college books you need is the first step to getting cheap textbooks.
UCSD College Bookstore
But if you are on a tight budget for college, you might want to keep looking for other choices in textbooks, including internet purchases, used books, or online books.
Before you buy, consider how bad you need a textbook, and the return policy. For example, if you are wait listed for a class, and you need a textbook right away, can you buy one and return it within 2 weeks. What if you take 5 classes and drop one - can you get your money back for that book?
Most online stores offer new and gently used cheap college textbooks, at 50% or more off. Minimal highlighting is allowed in the books, and they also buy back textbooks.
Campus Book Rentals offers online college book rentals with 30 day risk free guarantee. Return your book for any reason within 30 days for a full refund. 7-14 days to ship. CampusBookRentals.com
You might also consider sharing textbooks with another class member, becoming study partners. Many times the professors lecture and the textbook is just reference or supplementary material.
More textbooks should become available on readers such as the Nook or Kindle, providing another choice in cheap college books.