You can take advantage of the deal by ordering online from the Shake Shack website or mobile app and using the code: "BURGERBUDS".
A ShackBurger is a single-patty Angus beef cheeseburger with lettuce, tomato, and ShackSauce on a toasted potato bun. Prices vary but it's normally $6.59 each here in Southern California.
Photo via Shake Shack.
