As several posters on the thread already said, this is a location-based issue. I was in Central Florida last week, and there were no systems in the stores I visited (Target, Best Buy, Wal-Mart, GameStop, Sams Club). Back home in South Florida, I was at a few stores (and have a buddy who services Wal-Marts and Targets), and neither of us have spotted a system.
Perhaps it is just bad timing on my end that I have not seen any systems in the stores or maybe I'm in the areas where demand outweighs the supply.
I don't doubt the regional findings though. I remember visiting a girlfriend in northern Georgia back when the PS3 came out. There were no systems when I looked in SFla, but I went into a GameStop there and spotted 6-8 of them (can't remember the exact count) and purchased one. Funny... I still have the PS3. The girlfriend is long gone. Go figure.