Where do you buy used books online?

@Bd200789 (2994)
United States
October 9, 2009 4:53pm CST
I've been buying mine from Amazon, but the shipping is too high. I was wondering if any of you know of an online store that has low or no shipping costs. All the stores I've found either have too high prices on the books, or really cheap books with expensive shipping costs.
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