When you are visiting Chicago you might try Heaven on Seven restaurant, I do'nt know if all the locations do this but I know that at least on of the locations has some deal if you bring in a hot sauice they don't have. They serve Creole/ Cajun food. Also Taco Fresco locations have a wall of hot sauce, not sure if they sell them or if it is just for the restaurant's usage. Now I'...