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 )
|National Gallery of Art by Kukla|
from Your City - Black and White (in colour!)
|Hummingbird and Bee by dibilio57|
from My Best Photo of the Week
|The Snowy Egret by Lee8282|
from Color - Monochrome
|Skate Boarder dpr-0927 by vbuhay|
from Skateboarding Cover shot