Perhaps furniture companies, anything else that everybody usually buys like snack foods or soda, energy drinks today too. It is a pretty tough fit in terms of marketing because there isn't a lot needed to play pool and outsiders are interested in fresh eyes in their demographic they are seeking to reach. If they are already reaching the target audience well through another activity it will be hard to sell them on investing where at best there is little bang for the buck, the advertising dollars spent.
Senior tour 1996, Taco Bell. They have been known to have a little imagination, might be worth a try. Add any fast food chain, maybe one or two down from the big boys but trying to get there. There are thirty or forty billboards circling around the track every Sunday. Might be worth approaching any and all of those companies. They might take a flyer on an event or two especially if you can guarantee wide coverage.
Hu