Quilter's Cottage and Accent Sewing in Myrtle Beach are both very nice shops.
Charleston has People, Places and Quilts. Theres is another in the the area, I think the name is Sit and Sew or Sew and something. There maybe others, theswe I have shopped. Check local Chamber of Commerce in Charleston and Summerville, SC
All the above mentioned shops have web sites.
When are you coming to my area? If I cam help in anyway just pm me.