Textbook used to put a big hole in my budget too, until I decided to go all digital and hunt down e-versions of the required books. Admittedly, not all were available, but I still managed to save a lot of cash. Probably the most helpful site I found is http://bookboon.com/. The site hosts thousands of textbooks in pdf format, all of which are 100% free and legal for download, so there are no copyright issues either. I recommend it to everyone.
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