[yorkiegirl2]

Not sure about the ads you are seeing but most of the ones I see run about the same for standard pups listed on limited registration.

There are other factors as for price differences..Such as
Price varies by location
Full vs Limited registration
AKC vs. APRI, ACA
Male vs Female
The niceness of the dog Structure and Coat texture.
Pedigrees, Size, Health, Flaws (over or under bites)

And if the dog is a carrier it should be stated. If not someone who is looking for a standard pup and finds out after the sale the dog is a carrier maybe upset.