I'm sure that most of us have noticed that textbooks costs are out of control. Though my suspicion is that costs for philosophy textbooks have not risen as quickly as they have in other disciplines (the sciences, business), this is a pedagogical issue in philosophy as well: Students certainly won't do the reading if they don't have the reading material. So what can be done here?
I'm particularly sensitive to this issue because our institution is on a 10-week quarter system. Since most textbooks are produced with sufficient material for a 14-week semester, I tend to assign an even smaller proportion of the texts I ask students to buy than I would were I teaching on a semester calendar. In some cases, I can only reasonably assign one-quarter of the readings in a large anthology. Furthermore, because of the quarter system, students take half again as many courses as they would on a semester system, which means half again as many textbooks.
So I'd be curious to know if others are sensitive to this issue, and if so, what you do to try to keep students' costs in check. I'd also be interested in learning from those involved in the production or authoring of philosophy textbooks why costs are increasing and their views on the matter.