I don't know of any breeders in MA ( I lived in Boston for 3 years), but I just wanted to warn you against buying a mixed breed pup.
I have 3, and none of them were bred well. Although they don't have health issues, they could very well down the line. No health or temprament testing is done by breeders of mixes and it's very risky.
I will keep my eye out for some good yorkie breeders in MA
BTW I am so jealous you're moving up there, I miss it terribly!