I have a whole bunch of excellent K&B greenheads, 15, 19, 29, 35, 29R, 29S for sale on my website.
I also have some SAM engines like an original Orwick 64, a MadeWell 49, Ohllson 23 rear intake, 1946 model, still in the box with all of the papers including a return to the factory for initial service form. Never run except on the factory test bench. Operating Instructions, Parts List, Warranty Card. Crankcase as shiney as when it was first offered for sale.
Also a custom setup Nelson 40 for free flight, only tested by the engine builder.
Some TD 09s are also in this group.