If you have to buy books, check if you can buy it used: Used books do not quite give the same feeling as leafing through the crisp pages of a brand new book. But considering that you can get used books for almost as much as half the price of a new book, it is a small price to pay. My favorite place to buy used books is a local chain called “Half Price Book Store”. Check if you have something similar in your city. For text books, look online on bulletin boards, mailing lists etc, and price compare websites like addall.com
I also buy from Amazon.com and Half prices books.
Do you have any places you buy from?