Motor repair shops take in old motors all the time that work fine but have a broken base so they can no longer be bolted down. Some motors have damaged shaft bent or damaged key way. Motor shops sell them to scrap metal companies. Motors fall into the mixed metal category, copper, aluminum, steel, cast iron, are only worth about 5 cents per lb at the scrap yard. Go to all the motor shops you can find ask them if they have junk motors they will sell you. I bought a brand new 5 hp motor it fell off the truck and bent the shaft. It was a $500 motor I got it for $2. I hit the shaft with a 4lb hammer several times and bent it back almost perfect. Then I had to file off the hammer dents and it was a good motor. I have a 3 hp motor running an air compressor. I have a 2 hp running my lathe. I have a 5 hp running a hydraulic press. Most of the 12 wire motors are in a higher voltage range 480/600 volts. You will be very lucky to find a 12 wire motor not many people use them these days. All the high voltage motors are in coal mines 5000 volt AC motors are very small and light weight. A 100 hp 5000v motor running coal mining equipment is not much larger than the average 5hp 240/480 volt motor with a 4" diameter shaft.