Need a head for a JD 850

[Niji]

I pulled the head on my JD 850 (diesel) last week and pressure test showed a crack. I've got a link bookmarked that someone here sent me awhile back to get new parts from a Yanmar distributer for this little tractor, which was much cheaper than from JD, so I'll start seeing what the new price will be. There's a pretty decent tractor junk yard in Va I'm going to call today for starters--though I'm not overly hopeful.

Figured I'd go ahead and see if anyone here had any other good ideas for finding a used head for this one?

Thanks