For the longest time I was cutting up old white cotton socks, T-shirts, just about anything made of cotton that I had worn out, need to be replaced (or could no longer wear) or I did not like to wear. (It helps when your friend owns a towel factory also... good patch material there...)
I even went as far as washing the old patches. I still do. They make a good scrubber patch for cleaning out the black powder fowling where you really know that the patch will not come out clean in the first place. And then I throw them away after about the fifth time I use them.
It's not that I am a penny pincher, but there is really not all that much work to cleaning the used cotton patches. I finally broke down and Wal Mart had a sale on cotton patches. They came in a pack of 200 patches for cleaning anything from a handgun to shotgun. So I bought five bags of them. All they are it looks like, are scraps of old cotton T-shirt from when they make clothes in a factory. Instead of throwing the scraps away like they used to, they bag them and sell them at Wal Mart. :: Anyway, they are real inexpensive and they work.
As for the patches I shoot, well I buy them at Wal Mart in the fabric section, wash the yard of cloth, and then cut patch as I need it....