Michelle-It is so hard to find these dogs. When I had a litter I always posted it on dogbreedinfo.com (I think that's the site, I have it listed on one of my hubs). Occasionally there are other breeders that have litters available.
BTW-when one of my son's friends comes over and sees Tonka he always says, "Hi Toy Story Dog." So I went back and watched Toy Story again and you know he is right! Buster on Toy Story is a DAUG!!