For the college students out here who are tired of paying way too much for books, I was able to buy some of my $240 textbooks for only 20-30 books. How? By buying the international version. Same content, same problems, but a different cover/ISBN. Is it legal? Absolutely! These books are manufactured cheaply as a sort of subsidization for foreign students but are not supposed to be sold in the US (despite the fact they are sometimes manufactured here). Despite this, the burden of legality is on the seller, not the buyer. So if you need a textbook just google the title/author and edition along with the phrase 'international' edition.
Word of warning, a lot of these book resellers that sell international versions have terrible reviews. Both my friend and I found good deals and got the right books delivered but that might not be the case for everyone.