This Best Buy memo from today, the 20th of December, says there will be another shipment of Xbox 360s this week at all Best Buy stores.
It hints that the consoles could be arriving as early as Wednesday, but it doesn't mention how many units stores can expect to receive.
Interestingly, the memo tells Best Buys employees not to issue rain checks after they run out of the product.
The official plan is to remove any signs from storefronts that mention availability of the Xbox 360. So if all those signs suddenly disappear from the front door, it may mean that you should check back the next day.
Also, be sure to use the magic phrase 'I'm looking for an Xbox 360' when the door greeter asks, 'What brings you in today,' otherwise you might not be escorted to the 'controlled sales area.' Employees are supposed to keep the console's presence on the down low, both before and after its arrival.
Good luck, and don't forget to practice the secret handshake as well." [link
Related Link:3rd Shipment of Xbox 360 available at Best Buy this Week