And sometimes you can get a good deal at yard sales, less so in flea markets, estate sales are good. Depends on the place, time of day and who wants to get rid of it and why, and if they, themselves are quilters.
I saw a lovely old treadle for 29 dollars at a yard sale, but when I was searching through my bill fold for a 20, I noticed a young couple looking it over and she was gazing at him as if he had promised her the world. He dug out the 20 and marched over to pay for it while she held on to it with one hand. I laughed with the seller and moved away, more power to that young woman and long may she sew. I didn't really need it anyway.