So far, only companies that only ship inside Canada.
Maybe the American Iris Society can help find a source, like a private trade:
http://wiki.irises.org/bin/vie...
Have you asked pardalinum and Calif_Sue by personal Tree-mail? They might know someone, even if they haven't listed it as a "Have" in their own Plant List.
We do have an "Irises" forum - but searching it did not turn up prior discussions.
It might be worthwhile posting a new request thread there - "do you have KP or know anyone who does?"
http://garden.org/forums/view/...
I also searched the Plant and Seed Trading forum, without finding Klingon Princess.
It might be worth posting a request there, too.
Qapla'!
(K'plaah)