What's a good website for less expensive college textbooks? And do i need an ISBN number?

Or anything else i need to know about buying them online?|||i got most of mine from amazon.com for only about 99cents. you do need the isbn number, OR to know the title of the book and what it looks like. (just to make sure its the right one). you search for it, and look under the used books link. they go anywhere from 30 cents- 50 dollars normally. which is better than 20-220 dollars in the book store|||You should buy used college textbooks at GreenTextbooks.com - Saving the Planet One Textbook at a Time GreenTextbooks.com is your online leader for finding used textbooks, DVDs, CDs. http://www.GreenTextbooks.com

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|||The site I tend to use the most is http://www.bigwords.com . They are by far the best search engine based web site for textbooks out there. The reason I think they're the best is that they compare many items at once, and calculate the best combination of stores to buy at, including coupons and shipping. They also let you include or exclude international editions, and even renting is an option through them. They even let you choose the ship times and then calculate the lowest price using the right shipping type at every store. Its an amazing search engine for textbooks for sure and all ways help me find the best possible prices out there.|||textbooks.com they actually buy the book back from you sometimes.


amazon.com|||Half.com is by far the best