Here's some that I found and have talked with about purchasing another Yorkie, but I haven't bought from them....you might already have their info, but if not, they would be worth checking out!! Good luck and please post when/if you found and purchase one.
www.stonewallranch.homestead.com - Bentonville
www.fantasyyorkies.com - Missouri (north of St. Louis
Another (can't remember their website right now, but they are in Winslow called Blackburn Kennels or something....I think their last name was Walters (but you can google it and see what it brings up).
and then there is another in Pea Ridge (no website), but send a private message if you would like her phone number.
Regarding the size of the female....I was told by numerous breeders and several vets that the female needs to be larger than the male...I do not know if this is standard or not, but that was what I was told....
Hope this helps and good luck!