Burger King Coupon: Get a Whopper Free with Purchase of a Whopper! HOT COUPON!December 21, 2012 by SMFM Leave a CommentBurger King CouponBe sure to get this Burger King Coupon! HOT new coupon just popped up: Free WHOPPER Sandwich with purchase of WHOPPER SandwichÂ at Burger King (up to $4.29 value). You can print two! Grab Your Coupon Here!