I've never been to any of these but would love to move to Conway, SC which is a little bit west of Myrtle Beach. I found this little list in a quick google search.
1.Sew Many Common Threads|(843) 347-6000
2290 Highway 544, Conway, SC|
2.Sewin' In the Carolinas|(843) 236-8901
3246 Waccamaw Blvd, Myrtle Beach, SC|
3.Nancy Bandel Quilts Llc|(843) 756-9528
3438 Alton Rd, Loris, SC|
4.Quilters Cottage Inc|(843) 651-4004
2571 S Highway 17 # 2, Murrells Inlet, SC