It is becoming ever easier to ensure textbooks are available in accessible formats before adopting them for course instruction. While not an exhaustive listing of places to procure alternate format textbooks, the Accessible Textbook Finder is a valuable resource for beginning a search. Searching here will return results that fit into one of three categories:

Green Yellow Red
AccessText Network RedShelf Learning Ally
Bookshare VitalSource Open Library
  Project Gutenberg  
  National Library Service  

*Green - likely readily available

*Yellow - may be available with extra steps, sometimes extensive and/or costly

*Red - not likely available

Accessible Textbook Finder