I haunt my thrift shops for two things--scrubs and sheets. I only buy 100% cotton and won't buy anything without a readable label. I find the scrubs (tops mostly) have really cute fabric and are high quality cotton. If I can find an XL, I can easily get a yard of cotton out of it. The going price here is $3 - $4 a scrub, so that is a bargain. I also look in the sheet/blanket area. I recently bought a "quillow" that had fabulous novelty fabric for $3 and after I took it apart I had over 2 yards of fabric!! I also use sheets for backing. I am fortunate that our Goodwills here have 50% off everything days about twice a month. And "seniors" get 25% off everything on Mondays. What a deal!