Black Friday is more than the day after Thanksgiving; it’s a national holiday in its own right. Hordes of turkey-weary shoppers line up outside their favorite stores in the wee morning hours hoping to make the most out of the savings extravaganza.For some, it’s like a combat mission, but for others, it remains a mystery. Exactly how do some shoppers manage to snag carts full of the best merchandise for pennies on t...