Door buster deals, like the Xbox deal, are sold at a loss. They are designed to get you in the door so they can sell you accessories, batteries, service plans, etc...
At the BX on base, they had a huge pile of regular price xbox systems, and a lady stationed there to tell people that they were out of the sale price ones but still had "a few" of these other ones right here, so...
So I walked out and completely by accident stumbled across an article that mentioned microsoft's online store had xbox discounts. I checked the microsoft site thinking no way they'd have the same discount price, but sure enough they had ALL of the black friday discount prices still available as late as mid-day Saturday, plus some other ones I didn't see in any store advertisements.