I have seen DS's hit or miss since Christmas. I went to CC a week or 2 back and they had about 20 of them, they I walked over to walmart and they had 3, then went to BB and they had 0.
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut