I can recommend Runner Outboards in Hookset.
http://runneroutboards.com
Joel is great to work with, though he is a one man show and this is his busy season, he has a great selection of 2 stroke motors.
Last year I bought a 1963 18HP Evinrude for a small wooded boat I had found. Joel set me up with a nice motor that he goes through and test before you pick it up. My boat is the last one in the slide show on his home page.