Who ever said you cant find a yorkie for that price in good health is just wrong.
My Ryo cost me 300 and he has Champion bloodlines. I called around and I was just honest with the breeder that I found in my area. She raises them all to be show dogs but if one falls short of the standard she adopts them out. My Ryo was just over 7lbs and i don't know what other standards he didn't meet but when we go walking people can tell he is from a great family.
Just take your time and search God will let you find one that fits your budget.
Start at the AKC website and look for Yorkies available you can also find a reputable breeder in your state on the
http://ytca.org/ website. That is where i started my search.
Kisses!