Black Friday has become its own national holiday. Not only that, but it seems to be spreading further across the calendar, crossing the lines that previously confined it to just Friday. Many sales stretch the length of the weekend and this year it's invaded Thanksgiving's territory, too, with some stores opening Thursday. With so many stores participating and savings galore to be had, you can't take Black Friday lightly -- you have to go in with a battle plan. We have eight apps that will guide you through the trenches of the retail war zone and make sure that you get all your savings with minimal exposure to the overplayed holiday music pumping through the speakers at every stop you make.
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