Wait, a Yorkie puppy is less then $200? Something doesnt sound right. I paid $500 for my furbaby without papers and I consider that VERY cheap. Have you heard of pet scams? Person pays for a puppy to be shipped but then it never arrives.
http://petcaretips.net/pet-classified-ad-scam.html
Ive also heard of people being sent SICK puppies.
Plus, the main reason why I dont like puppies being shipped is because you dont get to see where it lives, see the parents or inspect the puppy before purchase. IMO, thats VERRRY important. I dont care if it was the best breeder in the word. You can eliminate all the problems I dicussed above by seeing the puppy in person.
Please, when you do find a puppy that you are interested, go visit the breeders home, see where it is raised, inspect the puppy and the parents. It will save you alot of heart break in the end.