I agree that textbook costs are exorbitant, and I use open source, online, or very low cost books when teaching at the community college level. I've been using

I agree that textbook costs are exorbitant, and I use open source, online, or very low cost books when teaching at the community college level. I've been using the interactive version of the "Think Like a Computer Scientist" book when teaching the introductory programming course. The students still don't read the material, at least not before the lecture.