After looking for a while for a Wii console, I finally gathered enough intel to find one. Here are my findings. I should point that hese are for the Montreal region and they may vary from region to region.
Every major chain store (BestBuy, FutureShop, ToysRus) receives a shipment of about 25 consoles every two weeks. It is the same week for all the chains so basically, it means that Nintendo is shipping to the stores every two weeks.
FutureShop receives them on Mondays or Tuesdays.
BestBuy on Fridays.
ToysRus on Saturdays.
You know you're in the right week when ToysRus says in their flyer that 20 consoles are available on a first come first serve basis.
That's it. Good hunting!