It's back in stock as of 8/12 6:39pm PST.
The set sold out pretty quickly from Amazon. It still has yet to show up on Shop@Home though. We'll keep you posted when it does.
Amazon.com is now selling the 7958 LEGO Star Wars Advent Calendar
for $39.99. It qualifies for Free Super Saver Shipping. If history is any indication, the specialty Advent Calendar sets (read non-City) tend to sell out quickly. I would be surprised if this was still available by the time December rolls around. This is one item I would suggest not waiting for a price deal on. Free shipping and no tax to most states will probably be the best deal you'll get.