Paradise Brewing Supplies (Paradise Brewing Supplies) is on the East side of town at 7766 Beechmont Avenue. I go to both Paradise and Listerman's, depending on what I need.
The three in town that I know of are Listermann and Paradise (as previously mentioned), and there is a new shop on the west side of town called TableTop Brewing.
If your every in Dayton you must stop by Belmont Party Supply and BrewTensils next door. BPS has the best beer selection. They even have a single bottle isle which is nice if you want to try a beer but not purchase a four or six pack. BrewTensils is a great brew supply shop that has everything you need and a little extra.