From NACS:
During the 2018-19 academic year, college students spent an average of $415 on nine required course materials. That’s down from $484 on nine units the previous academic year, and a decrease from $701 since 2008, according to the Student Watch™: Attitudes and Behaviors toward Course Materials: 2018-2019 Report, the National Association of College Stores’ (NACS) annual survey of college students in the U.S. and Canada. Students also reported spending an additional $527 on technology and school supplies.