I find them at garage sales, on local Freecycle, and Craigslist.org for $0 to $100 for crud to good machines and cabinets. Sometimes rusted hulks are listed for $300 - $500 and up, but they don't sell. I have acquired many that are waiting for me to work on them "someday". Be patient, spend some time reading sites like EBay and Treadle-on, and you'll soon be able to spot a bargain. Many are just in need of a serious cleaning and new belt. Be sure all the parts are there, esp the bobbin case, and the machine isn't seized up. Carefully remove the machine from the cabinet before transporting to avoid a hernia and a smashed disaster if the head comes loose. Good Luck!