J.W.
amazon
One thing I found funny is I could buy them on amazon and sell them back to the school for more than I paid for them. :)
In case anyone wants to know how that happened, the kids at SLU complained that they were paying 170 for a textbook, selling it back for 50 and then the bookstore resold it for 110 used. So they came up with a policy if the professor requests it for the next semester they will pay 10 below the resale price. When I am paying 50 for the 170 book new on Amazon....well you know the rest. :)