If Tiffany Kennels does not have any left or you are not satisfied you can go onto the Yorkshire Terrier Club of America website and specify Maryland. They have a few more breeders listed there. You can call and interview each breeder this way.
http://www.ytca.org I purchased a male Yorkie from the Wolperts in Columbia, MD last April and they have been in the business for over 39 years. They breed and show quality dogs and are a valuable source of information on Yorkies.
Good Luck