Shake Shack has an offer for Buy One Burger, Get One Free (up to $6 maximum) via their app. If you are hungry for lunch or dinner, check this one out now through January 6, 2020! Use promotion code: THANKYOU19
Offer is available for one-time use only until 01/06/2020 at all participating Shake Shack locations on the Shack App or in-person at most Shake Shack locations, excluding airports, ballparks and stadiums. Max savings of $6. Minimum Shack App + kiosk order of $10 for offer to apply. Discount will be applied at checkout.
Hat Tip: Doctor of Credit