Almost all of it is grown in Novosibirsk, Russia. Some is grown in China. A bit is grown in the US.
Eksma Optics has close ties to a lot of crystal growth facilities. I'd start there...
Oh, and order at least two or three pieces, that lowers costs. You'll find custom crystals can have wide variations in properties and coatings. I know of very few vendors who will toss a single crystal into a coater... Usually they coat two or three and pick one for you. You might as well have the whole lot if they do this.
Getting it out of Russia yourself unless you are a corporation is nearly impossible.
My bet is 1400 to 3500$.
Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...