There are two in Murrel's Inlet/Garden City just out side of Myrtle Beach. The one is Coastal Victory/Indian in Murrel's Inlet. I forget the rates but I thought they were pretty good for the 3 or 4 day rate which is a good weekend ride to get to the Smokies from this area. Maggie Valley for me in Georgetown is a 6 hour ride.
That one in Surfside Beach (Hotshots Slingshots) went out of business or sold out but it is definitely not there anymore. Coastal Indian/Slingshot is the only one that does it now. I know it's $250 for 24 hours but I don't know if they discount for 3 or 4 days.