<p>After comparing prices with the used books at the co-op to those on Amazon, the co-op was definitely far more competitive than I anticipated. I'm actually buying about half from the co-op and half from Amazon and only playing $159.22 total for all my books for Fall 09. Sometimes the used at Amazon were MORE expensive, especially after the added $3.99 shipping on EACH book. So don't write off the Co-op before you check!</p>