
Have you contacted the Chihuahua breed club? With the price of these dogs being so high and all the con artists out there I would be very wary of buying one from anywhere else.There is no mention of any health checks(not sure which they need but must be some) or showing on that site plus they are offering a delivery service,all big red flags.To me it looks like just a way to sell pups which isn't ideal.There's a good article here about breeders websites and understanding the differences..
http://www.kaylenbergsiberians.com/BreedersOnline.htm(it's about Huskeys but can be applied to any breed)
I doubt posting links to breeders sites is allowed so may be taken off.