I just got this reply to a query I made directly to Hartblei regarding this lens, which appears on their website among their products:
Just wanted to let you know that the Super-Rotator lens is no longer in production.
sales / Hartblei Co
I thought I'd share the news with the forum. I was looking for a solution to add T/S to my P1 setup, but it seems that the Hartblei is one less contender in what was already a very empty marketplace.