This report from the Centre for Teaching, Learning and Technology at UBC looks at the use of open textbooks and other resources at UBC Vancouver over the past seven years. Since 2011, more than 47,000 UBC students have enrolled in courses in which instructors have used open or freely accessible resources rather than traditional textbooks. Students have saved at least $4.7 to $6.7 million as a result, and these figures are increasing each year. In the 2017 academic year, courses using open resources impacted 20 percent more students compared to the previous year, representing an estimated savings of $1.4 to $2.2 million.
https://open.ubc.ca/open-ubc-snapshot-use-of-open-resources-continues-to-increase/