Requiring an up to date textbook for math is just absurd. Pretty much anything you learn on an undergraduate math course hasn't changed for 100 years (and that's definitely true of Calculus I material).
Really the prof should just make his own assignments (or rather have his underlings do it). At least that's how it works on this side of the pond. In any case, requiring additional purchases of educational material when students are already paying tuition is absurd.