To Celebrate Chili's birthday on March 13th The company will be selling it's Presidente Margaritas for $3.13. But if you aren't up for celebrating in person...have no fear as they will be selling Gallon margaritas to-go! The gallon margaritas will be available starting on March 1st for $40 then they go down to the lower price on March 13th. You can also WIN one by going to their Instagram account and liking their post and make a comment with #ChilisBirthday. Just so you know if you do make the Presidente Margarita at home it is hand-shaken precisely 25 times when ordered in the restaurant.