I lived in Newton NJ when I was a toddler. Small world.
There is a very nice quilt author who lives there. Her name is Cheryl Almgren Taylor, and her quilts are awesome. This is her website>>
http://www.atimetosewquilts.com/index.htm
Maybe you could email her and ask where she shops. Look at her quilts. She has a ton of awesome fabrics!!
The shops in Clinton and Lebanon are very nice.