There are several choices for renting, downloading or purchasing text books online.
The campus bookstore, Titan Shops offers textbook rentals on many textbooks. Renting is significantly cheaper than buying, especially if you don't plan to keep the textbook for future reference. If the Titan Shops doesn't have your textbook for rent, there are other textbook rental choices, online:
There are a growing number of online sites to buy textbooks. The sites below are known to be legitimate search sites. When buying online, keep in mind the trade-offs: shipping and delays. If your book is $25 cheaper than a local bookstore, but your shipping cost is $19.99 and you have to wait 2 weeks, is the $5 difference really worth the delay and hassle? Also, check their return policy. Will they pre-pay returns if you purchase the wrong edition? If not, you're stuck with paying.
The campus bookstore, Titan Shops has a "Lowest Price Guarantee"...shop online sites for the lowest price...then show that price to the bookstore and they’ll match it, PLUS give you 25% of the difference.