My only advice would be to do an internet search on a regular basis. If you can find a breeder somewhat close to you, ask when their next litter is planned. With less common breeds, you sometimes have to wait a while for something to come available.
The other option, is find a breeder expecting a litter and fly yourself out if needs be to pick the puppy yourself.
I could be wrong about this, but because they are not extremely common, I feel like you're probably not going to run into too many backyard breeders. Find a breeder and call them up. Ask about their dogs, their breeding program, etc.. If you feel like they are being honest and straight forward, ask them to contact you once a litter is born and have them help pick which puppy would be good for you.
Lastly, I will add that there are thousands of dogs out there in shelters with all sorts of appearances and personalities. If you want something truly unique, get a little mutt! They'll thank you for it, and they are WAY easier to come by.