Open Educational Resources (OER) are teaching and learning materials in the public domain or licensed to give everyone free and ongoing permission to retain, reuse, revise, remix, and redistribute the materials. Open textbooks are a type of OER, and a large selection of open textbooks can be found at https://open.umn.edu/opentextbooks. Many MSU Denver faculty utilize open textbooks and other OER in courses to enhance the student experience and decrease course material costs. Courses with no materials cost (for textbooks, online homework systems, etc.) may be marked with a no-cost for materials designation in the course schedule, and courses with a total materials cost of $40 or less may be marked as low-cost for materials.