I always recommend the YTCA website even if you aren't going to breed or show, a top breeder is more likely to do health testing, because they are actually developing a line. Most YTCA breeders sell their dogs to pet-only homes, and the prices are very affordable, since they aren't actually in the business of selling puppies, but truly are trying to improve the breed. The downside is that many have tough requirements when it comes to pet placement, and some will not sell to homes with small children, for example. If you think you can pass the test, you should consider calling one of them. Here is a link to the YTCA referral site.
Yorkshire Terrier Club of America About The Club