This definetly smells like a scam to me. Are they shipping the pups from out of the country? I wouldn't trust anything that sounds too good to be true. Here's a thread where we were in contact with a scammer to scam them!
http://www.yorkietalk.com/forums/showthread.php?t=39127
There are plenty of good breeders here and I'm sure if this is a scam someone here will be able to direct you to the right place to get your furbaby. Good Luck!