It would be nice if you could backorder items that are not in stock - since you cant, you have to keep checking back.
*** Customer Service Response *** Please note that we provide a neat notification service for items that are
temporarily out of stock. On the rare occasion that an item is temporarily sold
out the usual order button is replaced with the following:
This will popup a dialog box that allows you to enter your email or phone
number to use to contact you as soon as the item is back in stock. Feel free to
test it out by clicking on the link above! Our custom notification service
avoids the inevitable problems associated with back orders. If the item is
listed as Out of Stock and does not have this button it is because the item is
no longer in production.