If all the seals are good, the bearings are tight, and the tines are in decent shape then I would say $200-$300. The old ones are built like tanks and you can still get all the parts to rebuild them. I did the seals and bearings in mine. I beat the crap out of it tilling New Hampshire dirt (lots of rocks). I see them occasionally on craigslist with a motor in running condition for anywhere from $400-$800.