I remember having to require spending $150 on an e-textbook, not even a physical book. If we don't get the book and show it as proof that we bought it, we fail the class. The only place I can purchase the book was in my college's bookstore and I bet they put that arbitrary $150 on it just to fuck with our already empty pockets. What's even funny is that the ebook expires within a year, I don't even get to keep it.