JoAnns Fabrics has them in pearly white, black and some others, if I remember
correctly.
You can get a pack of 5 yards for around a dollar. They also have a couple of
sizes, too.
A lot of times they have them in the clearance bins for 50 cents each.
My wife is a quilter and I usually go to the fabric/quilt stores with her. You can really find some good stuff there.
Ray, let me know if you don't have a JoAnns near you and the next time we go (up in Oklahoma or Denton area) I can pick you some up.
Have fun,
George