My first semester of college, I did what was suggested and left a list of my classes with the bookstore, and they gathered all the books together, ready for me to pick up a week before classes started. This cost me right around $300. The only books I really used were the algebra textbook and the book for my english comp class.
At the en of the semester, I went to sell them back to the bookstore and only got about $80. They wouldn't take the manual for a calculator my math prof. recommended, (which I didn't use, because I had a different calculator) because it was outdated. I couldn't sell back my math book because it was water damaged when they sold it to me. And my grammar textbook was outdated. Cuz the English language changed dramatically in four months.
That was definitely the last time I pre-bought my books. After that, I only ever bought a history book. Nearly all my other classes (all fine arts and graphic design classes) didn't need a book. My life science class used one, but it was all such basic stuff, Ijust used my notes from high school.
If the teacher tells you you need the book, try and find a friend you can go in on it with.