I have a couple of call in to some folks I know, If I hear back I will post the information for you. I also looked at the market bulletin but no luck there.
http://www.agr.state.ga.us/mbads/ but you might want to check there occasionally for cool stuff anyway!
Here's a link for a source, I have ordered seeds and will order more from this company, good source http://www.southernexposure.com/index.php
There is an old country store on Roswell Road 120 near Robinson Road in marietta (east cobb) that will probably have the answer for you
Morgan's Ace Hardware in Woodstock
109 East Main St. 770-926-85566 (ask for Keith)
I've seen bags of seed potatoes at the big-box DIY stores...
Sue, make sure you get a variety that will do well in our region. Southern Exposure will be a good reference.
Sorry...pays to read the dates. Info is late, but valid. I was in Lowe's in VA yesterday. They had seed potatoes. If you have a local Ace Hardware, check with them. Do you have a local feed store? They can be ordered from many places. Those sources will also know what will grow best for you in your climate.