I bought a spare motor for my 1919 non-starter a few months ago because I wanted something while I rebuilt the original motor. It is a complete 1926 motor with the starter and generator.
The guy that sold it to me put in .030 over aluminum pistons, new Kevlar bands, bushings in the trip gears, rebuilt coil ring, SS valves, and a new rear main. I saw it run on a test stand and he was kind enough to drive close to 60 miles to deliver it. He kept the timer -but that is not a big deal.
Without being specific -I paid less than $3,000