DETROIT — General Motors will roll out a new 'Red Tag' sale that starts this weekend and runs through January 2. Dealers can mark down amounts up to $2,000 per vehicle.The sale will cover 2006 and 2007 Buick, Chevrolet, GMC, Pontiac and Saturn models except for the Corvette and .The program gives dealers a certificate worth $250 for every vehicle in stock. They can choose where to apply them and jot the markdown on a red tag. GM held a Red Tag sale last year involving discounts set by the company. The new policy is to keep incentives tactical and regional, rather than across the board.What this means to you: You don't have to wait for an end-of-the-year clearance at GM — you can get started right now.