Shifster (NH)
 

Anybody have a shifster they are looking to sell (or ship) in the Southern NH/Northern Mass region? (plaistow/haverhill)

Good luck. I was looking for one a few years back and couldn't find one. Ended up making one myself that worked ok. But then just used a manual transfer case

Yep, that company went out of business, another company was making a cable driven manual shifter conversion, but they also went out of business. I never see either of these parts come up anywhere, so best of luck in your search.

As stated above, there are people looking for these. MAYBE (just maybe) you should ask at junkyards?
Maybe thoughtful dismantlers remove them?