There's room at Fulton county (FTY). Hill charges $131 a month for a tiedown, and Signature (formerly HawkerBeech) was about the same last time I checked. Shared hangar space is around $350 a month.
Stockmar (20GA), in Villa Rica, isn't too far and has plenty of room, including hangars. Jasper (JZP) is $35 a month. Covington (9A1) was $45 when I looked last (about 2 years ago).
I'd be surprised if Lawrenceville (LZU) didn't have tiedowns.
I think your answer is pretty much "anywhere but PDK"
What part of town are you in?