You've gotta watch the quantity for the Black Friday Specials. If you look at the Best Buy circular, the quantity on many of their items is less than 10 and you must get a coupon while in line or you won't get the special price.
Got to:
http://www.slickdeals.net
There will be a banner on top of the page about black friday, click that and there are about a dozen stores listing their Black Friday ad.
Good Luck!
Jim Smith