I went to a St. Vincent DePaul Society store a while ago. St. Vinney's for those that do not have them are places that take in old clothes, furniture, about anything other then out right junk and clean it and then resale it to anyone. They had two worn out 100% cotton sheets (yes they were clean). You could tell they were well worn, but they charged me .25 cent each. So I bought both of them. I have lots of cleaning patches now.