I grab those lawnbeetles whenever I can.
Theyre usually cheap/free and it gives good spare mufflers, carbies, starters etc OR I just chuck the engine on a different base. Just need to be sure you use the right spacers or the height will be wrong. The base then makes for a good sign out the front of the house.
Stick it on a pole with a stripped out engine bolted on with a sign on the pole - free lawnmower dumping here...
Pete