Dunno if you're interested in CAS or not but here's a few SASS affiliated clubs.
River Bend Rough Riders—Dawson Country, GA
Valdosta Vigilance Committee—Valdosta, GA
Bitter Creek Rangers—Ft. Oglethorpe, GA
Mule Camp Cowboys—Covington, GA
Lonesome Valley Regulators—Macon , GA
Cherokee Cowboys—Gainesville, GA
Doc Holliday’s Immortals—Griffin, GA
Georgia Mountain Marshals—Eastonlee, GA