I stop by my Goodwill (downtown Seattle) all the time and usually find lots of cotton quilting fabrics. Last week I found BRAND NEW cotton sheets (I bought lavender & pink) for $2.99 each that I plan to use as quilt backing. Also found a beautiful piece of white fabric with big bold burgundy flowers down the center. I plan to use that for quilt backing. My other great find almost every time I go in: quilt books for $2.99 (hardback) and $1.99 (paperback). Go Goodwill!