Need a little more information about the fern you are seeking. Common names are sometimes applied to more than one species, in this case Thelypteris kunthii(Widespread Maiden Fern, Kunth's Maiden Fern, Southern Maiden Fern, River Fern, Southern Shield Fern) and Dryopteris ludoviciana (Southern Shield Fern, Florida Wood Fern, Southern Wood Fern).
Both are hardy in your Zone and can tolerate a sunny location as well as mostly shade. Moisture requirement's are similar.
You probably can find both at the South Campus Perimeter College Botanical Garden during their plant sales or contact Drew at Deeprootsnursery.com (Willacoochee, GA)

I have bought Thelypteris kunthii at Home Depot in the metro Atlanta area in the past.

Certainly contact Perimeter College, they are the fern specialists. Sometimes they will sell plants on Wednesday.

Here is a link to their 2005 sales page and it has their phone number.

Here is a link that might be useful: GPC