Free Ruby Truffle with Any Purchase for El Social Members @ San Churro
Its a deal if you fancy ruby chocolate. Personally my palate didn't like ruby and couldn't get my head around what the hype was all about. Membership is free to signup and comes with free birthday churros.
From my memory, lowest priced item on their menu is a bubbacino for $2.5
Not sure how much the freebie costs though.