FREE Shake Shack Single ShackBurger

shakeshackShake Shack is offering a Shake Shack Single ShackBurger for FREE (regularly $4.99) when you download their new iOS app and use the promo code: shackappy for a limited time. This deal is for first-time app users only and airport, stadiums and ballpark locations are excluded. Deal ends February 28, 2017.

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