I just wanted to share my experience with saving money on text books. Most books will have a global edition that is typically identical to the text book your class is requiring of you. The ISBN will be different. Some school even have their own edition of books that have a unique ISBN. This can make finding that book difficult and makes the person buying it reluctant to buy it at all. In my experience, buying the global edition of that particular book i needed was often cheaper brand new than buying used or even renting. Of course you can always rent and buy used too which are both great options.