As universities and colleges seek to improve affordability for students, some are indicating which courses use free, low cost, and/or open course materials during course registration, in a process known as course marking. As leaders in open education and access to course materials, academic libraries may initiate, support, or lead course marking programs on their campuses. In this presentation, I’ll share the results of a national survey examining course marking practices at post-secondary institutions. I will examine how common course marking is in Canada, the units, processes, and systems involved, and trends among institutions not yet engaged in course marking.