Bell stated that Microsoft is simply running out of Xbox 360 consoles in the United States.
Apparently Microsoft did not predict this level of high demand they are receiving for the Xbox 360 consoles, nor did they have any way to predict it.
The reports from across the U.S. are that Xbox 360 consoles are beginning to be harder and harder to find, and it is expected to take a hit on the overall sales of Microsoft because of it.
Retailers have been pushing Microsoft to get them more Xbox 360 consoles, as the shortage is expected to continue through the end of February.
Microsoft has stated though that they expect to meet the demand by spring.