Best place to get a console or Wii Fit is Gamestop.
They come in UPS shipments (in multiples of 3 at least for the consoles) around noon time, usually Tuesday to Thursday.
Just call them around the time, ask if UPS came in with a new shipment and they 'might' hold one. If not, just go to the store..
Also, most stores today are no longer holding back stock for upcoming Sunday fliers. They are putting them out there. Target and Toys R Us are getting shipments pretty frequently.
Best Buy gets the shipments in if they promoted in the flyer.
If you are in Target, you can check the status via their price scanners. If they have buttons, punch in 207250001 - If it says Backroom YES, then they have them in the back.
Finally, use a tracker such as wiialerts.com
Right now, Bestbuy.com has the console only for $5.99 s/h
Not to promote another board, but check out the Wii availability thread @ fatwallet
http://www.fatwallet.com/forums/deal-discussion/788395