Philosophy Books

In my philosophy class we were forced to buy 6 books. So far we have used two books and we have only read like half of these books. I feel that my professor has wasted me alot of money unecessarily. I could have like a hundred dollars in my pocket tonight but instead I'm just looking at 6 books that will never be used. I know the book store will probably only buy them back for like a quarter of the price too and This makes me mad.