(Firehouse Designs)We’ve seen retailers make a big gamble for events like the Super Bowl (and lose millions in merchandise, in one case), but this might be the first time we’ve caught wind of a car dealership willing togive out free cars just to woo Black Friday shoppers. In what one Chicago-area Buick dealership is calling a “White Friday” sale, customers who buy any brand new Buick or GMC vehicle on Nov.