According to the 2015 National Student Financial Wellness Study at Ohio State University, 3% of the 4.8% of book funding is paid by credit cards.
National Student Financial Wellness Study, Ohio State University, 2015. cssl.osu.edu/posts/documents/nsfws-key-findings-report.pdf
What is the difference between Affordable Instructional Materials (AIM) and Open Educational Resources (OER)?
To the end user, they are the same; to the professor, AIM provides more options.
Affordable Instructional Materials are teaching, learning, and research resources that are either in the public domain, have a license that allows them to be used for free, or are items paid for by your library. AIM includes OER items. An example of AIM is a book purchased by your library that you put on reserve for students to use.
Open Educational Materials are resources for teaching, learning, and research that are free and openly licensed. These may be in the public domain. Sometimes the user has to pay for a print copy, but otherwise they can be used at no cost. An example of OER is the textbook Principles of Microeconomics from OpenStax
If you have any questions, feel free to contact me through the links to the right.