I'm guessing they are saving some of the better deals for their "secret" sale to be posted on Thanksgiving. Proabably don't want to tip their hand to the competition, especially since it looks like a lot of stores are doing similar things on Thanksgiving.
Maybe next year we'll have almost live, real-time responses to each other's ads, lol. BB will post a $299 laptop, an hour later, WM will have a $289 laptop on their site, etc...