Hi,
I checked out the website you were talking about. Cute puppies YES. The fact is any "breeder" that is advertising several breeds to sell is a major RED FLAG.
If you are wanting to buy a yorkie, maltese etc. You need to go to a reputable breed that focuses on one breed. A "tea cup" yorkie is another selling technique. There is no such word in a yorkie breeders vocabulary. Any dog that is less than 3lbs you really want to talk to a vet or someone who is objective and can tell you about their health issues.
Hope this helps. I have a female yorkie born 11-6-2009 if interested. I live in San Diego!
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I wish you luck and hope you find your little puppy soon!
Take Care Vicki