To be quite honest, I would wait first to see what the sale is going to be. My Wal-Mart last year had the Xbox 360 with Kinect there a while. I would say just go there around 10ish and wait in line. Honestly you should try online as well (pretty certain these were online, and typically amazon likes to one up Wal-Mart).
One other thing is to check Thanksgiving deals.
For what I was interested in last year, Thanksgiving day had some great deals ($30 for a PS3 Dualshock 3 controller at Meijer).
Might even be some great online deals if you can tolerate the shipping wait (buying on Friday you likely won't have it shipped til Monday and won't see it til Wednesday or Thursday).