I do not know anyone personally saling a used pontoon, but check out Plapps. If they don't have what your looking for they will put you down on a contact list if something comes in that you may be looking for(size, style, type, cost). I know they have myself and buddy down for anything that shows up that meets our criteria. The link is http://www.plapps.com/pre_owned_list.asp
Plus they are some super people!
Good luck on your boat search.
Eric J. Hickman Jr.
U of L Bass Club
Tournament Director
ewalk30@aol.com