I really hate when the professor makes you buy their own book for the class, thats pretty messed up. I had one professor that was in the process of writing the book and he would give us photocopy packets of each section, that was cool. But I also have friends that had to buy "books" their professor wrote that were just printed papers in a notebook.
You know what makes it all worse, that professors usually get a kick back from the publisher for using a certain book. Thats crap if you ask me.
Glad Im done with the college thing. now the only 'school supplies' i have to buy are Kendo/Iaido gear for my class that happens to be through the community college. Some of its expensive, but you also have choices on what to buy (and actually can get away with only spending like $35) and it lasts way more than one semester. Plus the class is fun.
-Darth Simon