I came across this article recently and thought it was good.
Why Do Puppies Cost So Much? | Best In Show Daily | 2015
A cheap puppy should be a red flag, not an incentive. I know buying a puppy from a reputable breeder can seem expensive but a good breeder has put a lot of time and money into their dogs. A good breeder will breed good examples of the breed...they should look like a yorkie, act like a yorkie, and should be healthy. They should be health testing (not just an exam at the vet) and give you a good health guarantee.
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.