Second searchtempest. Depending on how you set it up, it can miss listings, so you need to play with it. Craigslist should do a search function like that on their site.
An M without an engine is like a pincushion without pins. Nice to look at, but there is no point.
I want to get a Mac 19 (looks like an M but is 7 feet shorter) and I have a 150 hp two stroke for it already. That should get up and plane!