https://shakeshack.com/#/ Big Shack Sandwich for Free with a Purchase of $10 or more when you apply promo code SHACKCHEER at checkout via the Shake Shack Mobile App online , or in a restaurant at a kiosk. Select free pickup where available, otherwise, delivery fees will apply. Note: Valid through December 7 at participating Shake Shack locations. Offer excludes all paid add-ons such as avocado and bacon.