Textbooks... && John Mayer

While listening to John Mayer radio station on pandora, I am ordering my textbooks for school.  Cannot explain how expensive college books are, it makes me a little sad on how much I have to spend for the semester.  But on a brighter note I love John Mayer, and I have side tracked a bit on pinterest.
So anyone want to tell me a cheap place to go to get tickets to this place?

That would be awesome!

XOXO Catherine