Free Shake Shack burgers!
Shake Shack is offering a LTO for Buy One Burger, Get One Free (up to $6 maximum) via their app (iOS or Android) when you use promo code THANKYOU19.
(We found it also works as a $6 off any $10, so give that a try if you’re into their chicken sando or their ‘shroom burger and a shake.)
The offer runs through 1/6/2020 at participating Shake Shack locations on the Shack App and on order.shakeshack.com (excluding airports, stadiums and ballparks).
One time use only. Minimum order of $10.00 required and supposedly you must add two burgers to your shopping cart prior to checkout but we had success with a single burger plus other items totaling more than $10.