How much does a yorkie puppy cost?

I am getting a dog for 500-600 from a breeder.I am a kid but i see adoption centers have dogs for 250$.I think to pay 500-600$ for a dog is a lot but you usually get a garantee for a healthy dog for 2 years and comes with shots.It usually grows up in a welcoming and social inviorement. I suggest petfinder.com first for adoptable yorkies and then look for breeders. I am a kid if i could i would want to get a dog from the shelter and save a life but I really want a dog and its already born so i think that is still giving a pet in need a loving home!!!