I've made an extractor using a food grade drum that is powered by a 1/2" drill. If you were to buy a mass produced extractor of the same variety you are talking in the $800-$1000 range. And that's for a hand crank extractor. I think I have the costs down to a point I could sell the guts of the extractor with assembly directions for a much more reasonable price than a commercial bought extractor. All you would have to do is find and buy a food grade barrel and assemble the extractor which takes less that 30 minutes, including drilling a 1.5" hole for the gate valve.
Would anyone be interested and how much would you pay for something like this?