Why don't you look at Petfinder .com? There are hundreds of purebred Yorkies that are looking for homes.. People think that dogs at shelters are somewhat worse the the ones from puppy stores or from breeders, which is not true! They are just the unlucky ones who lost their homes and are looking for another, forever one. They come checked by a vet, neutered or spayed, vaccinated, sometimes even microchipped. I adopted one few months ago and he is simply wonderful.. it's like he knows that I gave him a second chance..
I found few on Petfinder for you. check them out please.. they are in IA but they do out of state adoptions:
http://search.petfinder.com/petnote/...?petid=6849691 http://search.petfinder.com/petnote/...?petid=5783074 http://search.petfinder.com/petnote/...?petid=6882493
there are tons of other ones too.. just contact a rescue in the area and they will help you