Most students in the MA program do not buy books. They have them in the library that you can reference if you feel the need to and the professors are more than willing to answer any questions you have. I felt that the powerpoints were more than sufficient preparation for the exams. I did not buy any books and was able to do very well. It's really up to the student though, if you feel that the extra information is needed to help you understand the material then buy the books, but be forewarned that you won't have much time to peruse extra material.