You should go to Galco's in Highland Park. It's a whole store dedicated to sodas. There's at least five different kinds of root beers and rose water soda, cucumber soda... if you want out of the ordinary stuff (the rose water and cucumber sodas are pretty to look at, if visuals are of primary concern). The man who owns it is a great guy and he'll help you out.
Wow thanks for the info! Ill check it out this summer!