National Cheeseburger Day is Friday, September 18th. Time to ditch your diet and scarf down some comfort food at a discounted price, or even free in some cases. Steak ‘n Shake– Steak ‘n Shake is offering all loyalty app members $2 off (aka 50% off) the Double ‘n Cheese Steakburger from September 18th through September 24th. Limited to one per order, […]