The only one I know is in Augusta Georgia, called Savannah River Cerakote. They are right off I-20 on Washington Rd. My brother uses them and has been very satisfied with their work.
http://cerakoteaugusta.com/

There is a guy in Aiken, but I don't know anything about his work.
http://veterangunsmith.com/contact.html

Bluffton has a cerakoter. Don't know anything about them.
https://www.facebook.com/CoastalCerakoting

And using google fu,

Here's a manufacturer's authorized applicator list.
https://www.cerakoteguncoatings.com/resource/locator/?

D&R Gunsmithing in the Charleston area is a certified Cerakote.  I have seen nice pics from them but have never personally used them.  

They are on 17A between Summerville and Moncks Corner.

I do Cerakote.

OCD

Tactical Firearms Finishes in Galivants Ferry does great work as well.

I have talked to them (Rich) and they are nice folks. The store I work at has a Glock frame inbound from them right now.

I've seen their cerakote at the gun shows and it's very nice. I checked out their multiple color camo jobs and they were impressive. One of them was real nice before an employee put it back in the rack sloppy and it fell on the concrete floor

Hey D16, what did you ever do on cerakoting that handgun?