I am aware of 4118d which has been put up for sale recently, located in the upper Midwest. Seems to be in decent condition, though I've only seen photos and am not involved with this unit in any way.
I have, perhaps foolishly, decided not to pursue it. If you are seriously interested in pursuing, please contact me off forum by clicking my ID, then sending an eMail.
A happy July 4th to all ... it is my son's birthday so we celebrate double (as an aside, I don't recommend time in a hospital ... especially the birthing center ... on a national holiday! Stay safe!).