Bookshare (bookshare.org) is a free accessible ebook library for people with a documented reading or print disability, including dyslexia, blindness, low vision, and physical disabilities that make holding a book difficult.
The collection includes a large number of textbooks. Books can be read with audio, enlarged text, braille, or a combination.
You will need documentation of your disability to qualify. Your campus disability services office can usually help you complete the certification, and connecting with that office is worth doing anyway, since they coordinate other accommodations too.
Sources: Bookshare, bookshare.org.