Have you contacted these people?
Some of them are a couple of hours away, but if you phone them, they may be able to suggest somewhere for you:

Chic Boutique
(843) 766-9424
Quadrangle Shopping Ctr,
North Charleston, SC 29405

International Wigs
(803) 779-8531
1643 Main St,
Columbia, SC 29201

Parisienne Wig & Hair Replacement
(864) 297-8235
2102 Laruens Rd Ste A,
Greenville, SC 29607

J MS Hair Clinic & Cyberhair Systems
(864) 859-0594
2031 E Main St,
Easley, SC 29640

The Wig Shop
(843) 651-4504
4560 Highway 17,
Murrells Inlet, SC 29576

Hair Bears
Hair Bear Inc
40 Windermere Boulevard
Charleston, SC 29407-7412