large transparency printing??
Try these folks... http://duggal.com/
I don't know if they have exactly what you are looking for but they do a lot of "high-end" and custom work so there is a good chance that they can come up with something if you are willing to come up with the cash!
No connection... I used them a couple of times in the film era, years... no make that decades... ago.
Frank ( http://www.gorga.org/blog )
|Nectar Dancing by Lensmate|
from A Big Year - birds
|Sad clown by PEB|
|Mtl Gen X 2015 DP by MarioSS|
from - Gen X - (In Full Colours+ Border)