University textbooks, for 5 courses over one year (year = 2/3 of the calendar year) can cost you from 450 to 1000 dollars, Canadian, over here at Dalhousie. And they come out with "updated" editions every year or so. They charge you the 100+ dollars for Blahology, 4th edition whereas you can't even sell Blahology, 3rd edition for a thrid of the price. The differences in the editions can be as little as a new chapter and some format and colour changes. Oh, and the cover art.
I found a giant, thick, and incredibly resourceful Psycology book (1st edition) in a cardboard box labelled: FREE in my Student Union Building. The 2nd edition is in the bookstore for well over a hundred dollars. And the differences were minimal.
A lot of people do buy the second hand books and save a shitload of cash. The point is, this world loves to rip you off. Get used to it.