I've been to the one across from BJ's....Quilt and Sewing Center, I think. They have a large selection of the designer quilting fabrics that are such a beautiful weight. Amy Butler, Michael Miller, etc. But it does tend to run a little $$.
One of my favorite sources for trim is River Run Antiques, downtown. There's a booth there that has a TON of vintage trims. It's a treasure hunters dream!