In Nashville there are none, but right outside of Nashville in a town called Murfreesboro there is a decent HobbyTown USA.
https://maps.google.com/maps?hl=en&ie=UTF-8&q=hobbytown+usa+murfreesboro&fb=1&gl=us&hq=hobbytown+usa&hnear=0x8863f80e5b170141:0x850cb92ad6b577f6,Murfreesboro,+TN&cid=0,0,338752621363316982&ei=DjMUUfTFLqHi0gHmjoC4CQ&sqi=2&ved=0CIoBEPwSMAA
As far as I know Atlanta doesn't have any hobby shops for models, but some wheres outside of Atlanta in a place called Kennesaw there is a HUGE HobbyTown USA.
https://maps.google.com/maps?hl=en&ie=UTF-8&q=hobbytown+usa+murfreesboro&fb=1&gl=us&hq=hobbytown+usa&hnear=0x8863f80e5b170141:0x850cb92ad6b577f6,Murfreesboro,+TN&cid=0,0,338752621363316982&ei=DjMUUfTFLqHi0gHmjoC4CQ&sqi=2&ved=0CIoBEPwSMAA