If you look through SDN classified over the years, you'll see that if you want them fast, it doesn't usually work out well. When it comes to taking full advantage of SDN classifieds, you need to be willing to check often and not be in a hurry. That way you get current books and don't overpay for used materials. If you are in a hurry, then the company website is the fastest way to get them (and it costs the same). Had you mailed an order form on 3/25, it would have been received and processed by probably 3/28 and the books would have been shipped this past Friday (3/29). Depending on the type of shipping you chose, it would be arriving either tomorrow or Wednesday.