Back in the late '50's we used to go to Burkhardt Bottlers and pick up a case of quarts once in a while. We lived near Archer & Oak Park at the time and it seems like the building we went to was just NW of Archer & Canal. You would pick assorted flavors and put them in a wooden case yourself. Now-a-days businesses are afraid if you enter a parking lot, let alone the warehouse.
Another was Cadillac Soda. Priced at .25 a quart it was pretty good, but what made it even better was the .15 cents we used to get back for the deposit. Cadillac had a clear look to it, like Green River soda, and came in maybe six flavors, bottled in a plain bottle. No design was molded on the bottle, just smooth glass with a simple paper label. Cadillac was early '60's, had to be local, and didn't seem to last too long, did they price themselves too cheaply?
Then there is Filberts Root Beer. Still in business they now have a multitude of flavors in addition to the original R/B. Never had the flavors but the R/B is excellent. They are at 3430 S. Ashland Ave. I'd bet they are still family owned and operated.