You can usually find a vendor or two selling feedsacks and vintage quilt tops at quilt shows. I've seen them several times. I have also found a bit here and there at estate sales. Once I bought a box of 2" squares cut from those fabrics, and made Granny Square blocks out of them. (They are still not a quilt!) I have a small collection of bigger pieces that I don't want to cut up! The only use I would think of for them is a quilt in a vintage pattern.