I took a look at their website and have a few concerns.
http://www.ayorkieisforever.com/
They seem to sell many different categories of puppies when a reputable breeder only sells one - the best puppy they can produce.
They sell what they call "standard" Yorkies between 5-10 lbs. The Yorkie standard is no more than seven pounds so they are not breeding to the standard. That is a huge red flag.
Also, they offer two types of stud service, one for pet quality. Pet quality dogs should be loved and treasured, but should not be bred by a breeder who respects the breed and wants to protect it's health, appearance and disposition.