yea, don't but your books at the university, unless its some wicked low-printed book that they only carry in which case you're fucked. Libraries are good, too, if they have the exact book. amazon, half, ebay, you name it. fuck university bookstores
read that. it basically describes how the textbook market is a bunch of bullshit, and how they rip people off more and more every year for no reason except that they can, because there isn't a law saying they can't.