What do we want? Reasonable Prices!

And when do we want them? Now!
Why are college textbooks so expensive? I don't understand why this gigantic rip-off has been allowed to go on. Constant "new and improved editions" with a few chapters shuffled around are being released, forcing used editions to become worthless to the student.
My extremely overpriced Economics textbook itself suggests that if textbooks were included in the price of tuition, colleges would negotiate with textbook publishers and prices would go down to better market rates.
Students who need the book for class at, eventually, any price, have no leverage to bargain with. I think the system needs reform. Drastic, extreme, and immediate. I'm tired of paying far more than the pathetic things are worth. And any reform should be before I graduate, preferably. But how to go about pushing for this?