I haven't actually bought from her (but I'm strongly considering it) - but Tanya from tanyastinytots.com is very nice and helpful. Not a scammer or anything. She may have a pup available, but I'm not sure.
Another breeder is Linda from
http://bejazeyorkies.com, she's nice and professional, though I feel that her prices are a bit high for just a pet. :\ Same with Sandy from
http://www.wee-r-yorkies.com.
There is also Kelly from
www.worldkennelsusa.com which another user here recommended to me. I talked to her on the phone and she was very nice.
(by "very nice" I mean not rude, and they answered all my questions)
There are a few others who I have talked but haven't felt comfortable/impressed with. A few of them didn't even bother to answer my questions or return my e-mails/calls.
You can also check the ytca.com site, they have good breeders listed there. Good luck on your search!