Your'e right!
I live here in Glendale, Arizona and I haven't found anything in the state that comes from an ethical breeder that I like.
WELCOME TO YT by the way! lol
You may want to consider Yorkie adoption. If you don't mind an oddity and know what you want in regard to size at maturity, why not get a young adult? Give it a go, I don't have the links handy to post, but if you can't find them PM me and I'll be sure to get them to you.
You're right, $600 isn't going to get you a Yorkie that fits your description, unless either A you adopt or B you find that breeder that is looking for your services to barter w/. Keep looking and keep us posted! I know that if you go to other states for a Yorkie you might, but not here.
If you're willing to ship, that might be an option, but then again you'd be then looking at a shipping fee! What other breeds are you looking into?