This was a surprise. I went to the
Midwest Photo Exchange (MPEX) website tonight and they were advertising the 645Z as available for pre-order on their front page. That's interesting because they haven't carried Pentax since I've been going to the store. They do carry some other medium format lines, Hasselblad, Mamiya, Leaf, and Calumet. They carry nearly everything but Pentax in DSLR and mirrorless. I frequently go to the actual store when I'm in Columbus because even though they don't carry Pentax, they have about everything else, lots of tripods and heads, bags, lighting and other studio equipment. They did order a K mount Tamron lens for me last year.
I'll keep an eye on the 645Z because they have a lot of demos with reps, in house and at shows.