[gnicholas]

FYI, if you are a student with a 'qualifying print disability' (which includes visual impairment, dyslexia, and other learning disabilities), you may be able to get free access to hundreds of thousands of books/textbooks via Bookshare. [1]

They get digital versions of books from the publishers and make them accessible to people with print disabilities. This means adding image descriptions and offering various text alterations (different text sizes, special fonts and colors, etc.) to make them easier to read. They also offer math-based tools to make equations accessible.

Bookshare is 100% free to any US-based student who qualifies, and various other countries have agreements with Bookshare as well. They are part of the tech-for-good nonprofit Benetech and are based out of Palo Alto.

1: http://www.bookshare.org.