Another note. If you're looking for that awesome 75" TV on sale, or some other electronics (cptr, headphones, etc...) beware.
Most manufactures build cheaper models just for black friday sales. They won't be of as high a quality as similar TVs throughout the year. The only way to make sure you're getting a good deal is to see if the model you are buying has been out for several months and has thousands of reviews. If its a new model, its likely a cheap version just for "Black Friday".