I would look for some kind of online downloading place - they might not have new books, but a lot of older ones where the copyright has expired on should be available for free downloading, legally. I can't remember exactly what it was called, but I want it to start with G (Greenberger? I don't know), and it also had 'Project' in it's name - it's like a website where a lot of these books are available. Sorry I can't be of more help there.
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I would look for some kind of online downloading place - they might not have new books, but a lot of older ones where the copyright has expired on should be available for free downloading, legally. I can't remember exactly what it was called, but I want it to start with G (Greenberger? I don't know), and it also had 'Project' in it's name - it's like a website where a lot of these books are available. Sorry I can't be of more help there.