I would watch craigslist.org Denver/Boulder, there was a yamaha 25 horse for sale 2 different times, I noticed because I own one, and would highly recomend the engine, its a four stroke, and very fuel efficient, and trolls down very well!! I think he wanted $2500. for it. You might even put a post on there to see if someone responds--there is a boats category, and that's where I saw it, roughly 3 weeks ago. Good Luck!! I went back and found the ad: check out [email protected] <[email protected]>This one is a 2 stroke, and the ad was modified yesterday, so it should still be available.