https://www.facebook.com/groups/BatCityPinball/
Ironic, I'm the one posting this since all the locals know I don't have facebook and despise it.
A bit of a drive but we have league on Tuesdays where their is normally 30-40 players. A bit of a drive from Liberty Hill though since it's at the original Pinballz location. Their is talk about starting a league at the Lakecreek location which would be much closer for you.