Good used Rossi .61 engines come up on ebay all the time. In the past year Ihave gotten 2 of them less then 100.00 each. One had a bit of time on it but was a great runner, the other was a 5 port engine that had never been run. It had some powder in it that I never figured out wat it was but after some cleaning, a tear down and re assembly it runs better then any glow engine I have owned.