Not surprising. Dell has quietly canceled all the orders placed for the price mistaken Dimension 4600 desktops. It is always worth trying at least.
Per Dell:
"Numerous customers ordered Dimension 4600 systems from the Small Business site yesterday attempting to take advantage of a $400 discount. As the price point on the website indicated, the price of that system was intended to be $894 after discount. Due to a site malfunction, numerous customers attempted to reconfigure the system and place orders for amounts significantly lower than this. As the website indicates at the bottom, Dell cannot be responsible for errors, omissions, or consequences of misuse of site and its functions. In addition, the site indicates that orders are subject to cancellation. In this case, because of this error, these orders have been cancelled."