Here is a good place to start you search.
Breeder Referral - Official DPCA Breeder Referral Directory
After you find a litter come back here and ask about the breeder before you commit. Just because a breeder belongs to the DPCA does not guarentee they are good breeders.
Also it may take you quiet a while to find a good breeder with a litter so be very patient. Read this example of what happens when you get in a hurry.
Should I be concerned?????