I have seen an ad recently in either Successful Farming or Prarie Farmer. I think it was about 5 grand for a 404 replacement. May have been TSR but not sure.
Wayne's repair,a combine salvage yard at Fessenden ND has a load of JD turbo combine motors for cheap. He has too many and wants to move them. call shop:701-547-3682 or Home 701-547-3845