As OP notes, though, textbooks aren't mandatory costs. A few classes will actually use the books extensively. Most others will deliver all the information in the lecture, with the textbook being referenced in the syllabus and never talked about again.

I'm an auditory learner who only ever used the books when there were homework problems out of them. I saved a ton of money in college by getting good at guessing which types of classes/professors would actually require the book, and I would not have appreciated seeing the books bundled with tuition.