Hey Eugene, As you are a GPAA member, I strongly suggest that you touch base with the local chapters, 3 in NC and 1 in SC (Look in the chapters section of the GPAA site to get the info on location and contacts), as they might have their own places or claims they go to prospect, or can point you to places to go.
Like my friend Tim said, the GPAA has a claim at Coker Creek, TN that you can go to 24/7, 365 days a year, camping is available for free (no hook ups) and there is a place right down the road from there called Doc Rogers Field, that you can go to prospect, even though it's in the Nat Forest, the Rangers of the Tellico Plains area allow sluicing and dredging,but you need their permit that is free and can be gotten right there at a store in Coker Creek. (Remember on Nat Forest land you can only use pan and shovel and classifiers, no sluices or dredging, and cannot take anything but your black sands and concentrates out with you [ no buckets of unpanned material ], and you must stay within the water line. The Tellico Plains District is one of the few that allow dredging/sluicing/highbanking because of the work between the rangers and the GPAA chapter there. Always fill in your holes when you're done.)
As far as pay to play in SC, I have researched for a yr and not found any places in SC to go, at least none that advertise or have a website, there may be some that you can find just driving around in the slate belt in the western half of the state which is where the gold is in SC.
Speaking of Nat Forests, I have heard there is some gold in Uwharrie Nat for, Nantahalla Nat for and Pisgah Nat for in NC, and you might want to check Sumter nat for in SC. If you draw a line from Athens, GA to Charlotte, NC, west of that line is your best chances to find some color. Just a note, the National Forests on the east coast are all acquirred lands ( purchased land or land taken over from unclaimed estates, etc.), so there is still alot of private property in those areas. Just have to be careful about being on private land.
Anyway, that's my opinion, for what it's worth. Take advantage of your GPAA membership and hook up with a chapter, and "mine" them for info. Paul