I don't remember shortages, do you have a link? What I found is an article like thisIn the case of the X360 this last holiday season saw some shortages from MS for the Premium and Elite versions.
http://www.informationweek.com/news/showArticle.jhtml?articleID=205918713
Overall it looks like a good time to cut the price unless they are really determined to make it a sound business at this point in the console life cycle.Microsoft Xbox 360 Sales Fall 2.3% As 'Halo Effect' Fizzles
Microsoft shipped 4.3 million Xbox 360 systems in the three months ended Dec. 31, compared with 4.4 million systems during the same period in 2006.
By Paul McDougall
1 25, 2008 12:15
Microsoft sold fewer Xbox 360 video game consoles during the lucrative holiday shopping season than it did the previous year -- despite September's launch of the blockbuster Xbox 360 title Halo 3.
Microsoft shipped 4.3 million Xbox 360 systems in the three months ended Dec. 31, compared with 4.4 million systems during the same period in 2006-- a decline of 2.3%.