I'm in the San Francisco Bay Area and I paid $60 for my fully functional 1919 New Home treadle sewing machine, $100 for my fully functional 1894 Pfaff hand crank and $250 for a very rare 1870 Gold Medal Octagon hand crank that functions, but needs a worn part custom machined in order to keep it from dropping stitches. On craigslist the prices seem to be a bit higher now than they were, but with $120 being an average price for both functional and ones that appear to function but may not actually have everything threre. ...And then a gain they come up in the free section sometimes too.
