From the Chipotle Facebook Page: Purchase $30 or more in gift cards at any US Chipotle restaurant between 11/16 and 12/31/12. Then bring in your receipt on your next visit (before 1/31/13) for a FREE burrito, bowl, or order of tacos.
This is a great strategy to save while eating out. Most restaurants offer a “Buy $$$, Get $$$ Free” option. Check out your favorite restaurant next time and see if you can save long term. (Because free food always tastes better.)