Try B&H Hobbies in Snellville on Hwy 78. They have everything hobby related and could probably order you Yoko parts from the west coast, and if you had a return, then you wouldn't have to ship back to the west coast. They are the most well stocked and knowledgable hobby store I have been to in GA.

I used to have a rare JDM/Canadian Yokomo "Honda NSX" that I bought from a hobby store owner once. The only place I could find any parts were from Cali and the parts weren't even exact. That car was cool as hell though and looked so authentic. It also had a mid-engine with beltdrive .