Open educational resources (OER) and open textbooks are a flexible and low-cost (often free!) option to publisher texts. The library of quality open materials is growing, and most licenses allow you to re-use or re-mix content with attribution. The Bookstore, Chemeketa Press or Tech Hub can help with providing student access to both print and digital formats.
Open Oregon Resources - A growing list of OER textbooks and content adopted by faculty at Oregon colleges.