I know the customer service guys at Five Star will drop you a note periodically with back-order status. If the order is unfulfilled after 30 days there's an automatic notification to be sure you would still like to wait.
Empire has a nice online order tracking system. If your order still has not shipped you can cancel it online after logging in to your account. They'll even let you add items to your order if you wish.
DVD Exotic will automatically split up your order into multiple shipments in the event that an item is back-ordered. Some forum members have stated that they have receieved free shipping on the additional shipments. I'm not sure if that's a standard company policy but it's a nice plus.


