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Not sure how long this will last, but Half.com is doing a promotion where if you spend $10 in product, you can get up to $25 free shipping. So no $3.49 shipping on a .75 book. :D
Great for hardcovers (got a bunch of Redwall hardcovers for $.75 each). But if you've been waiting for some books for quite a while here, you might be able to get them really cheap at Half.com during this sale then trade them in here for more!
Rather than re-explain it all, Slickdeals has a good writeup here: