"Students spend an average of $898 a year on textbooks". Mercury News writes about the students which is starting to struggle against the high-priced text-books. And as a former student at University I can say that it´s nothing new in this. The ways is of course to start opinions but also to use exchangesites and turning online, to Amazon and likely.
All the supplemental material that comes with the books is rarely used and the ways of putting out new editions is a couple of ways keeping the price at high levels. If this was made in a manner that wasn´t just to fill the pockets of the publishers.