This talk will examine the financial impact of OER, and other low/no cost materials, on textbook affordability programs, such as equitable access.Using data collected from the first 2 years of CU Boulder’s equitable access program, we will dig into the actual number of students using these materials, the cost savings realized by those students, and the financial impact on the program as a whole.We will also discuss the relationship on CU Boulders’s campus between the bookstore, library, faculty and departments to support and advocate for the adoption and use of more OER, low and no cost materials on campus.Finally, we will review future book store initiatives to introduce more OER, low and no cost materials to CU Boulder’s equitable access textbook program and the potential impact of those additions on students and the program as a whole.