http://maryjos.com/default.aspx/
It's in Gastonia, NC, about 30 minutes west of Charlotte.
It's a huge store, hasn't been renovated since 1970 (and looks it), but it's clean (even though it looks like a dump) and full of the most amazing textiles in every category - quilting cottons, silks, velvets, bridal, clothing, etc.
If you're passing by, it's worth the stop.