Good hunting, I looked for 15+ years, found one on e-bay new un-issued that went for over a grand, then finally at last years Aberdeen show (2010) I found about 6 all needing rework on handles and such, but laying out on the table for $75 ea (I would have /should have bought two if I had the cash).
I have some battery packs and the ONE unit I will mount on my MUTT once she's restored. My recommendation is to check out Aberdeen next year if you get up there, or ?????
Oddly enough the interior looks intact, no one seems to have screwed with demilling it by removing the Americum (radioactive) source, but then I detect no trace of it with a gieger counter either. Perhaps the half life has expired?
V/R W Winget
Virginia
Virginia Military Preservation Association
www.VMPA.us