Text books suck

It happened again. So many times over the course of my college endeavors in taking classes I will see one book listed in the Syllabus and another, though similar, book in the bookstore. I know, I know go to Amazon and get the book listed in the silly-bus, but I was on the short-squeeze this time, having taken a week off already and really just need the material for next class period, which would be tomorrow. Anyway the book I bought from the bookstore was 15 bucks more than listed, due to some fees and tax. Can't they just be on the same page instead of trying to screw with someone just that one inch further?