If you love Steak N Shake milkshakes, you will LOVE this freebie offer! If you claim the Steak N Shake coupon for Steak N Shake milkshakes, you can get one holiday milkshake FREE with your purchase of another milkshake! Use the BOGO FREE coupon to get one of these delicious holiday milkshake flavors: Cookie Butter, Egg Nog, Peppermint Chocolate Chip, and White Chocolate.