I would definitely suggest you contact Blumoon Yorkies. All her Yorkies have had bile acids tests to make sure they don't have liver shunts or liver disease they could pass on to puppies. This is one of the very few Yorkies breeders I would consider getting a puppy from myself since learning that Yorkies are thirty-six times more likely to have a liver shunt than all other breeds combined.
AKC Yorkies, Yorkshire Terriers, Champion Yorkie males
There are also several Missouri breeders on the YTCA breeders list:
Yorkshire Terrier Club of America About The Club