One way to find self-assign shops is, sign up with every MSC you can find, and set them all to send email notifications. Virtually every email received will specify in the Subject line if it is self-assignable.
I dunno if that's the BEST way. But it's ONE way.
D'Agosto
"What does it mean? You ask. I answer not/For meaning, but myself must echo, What?/And tell it as I saw it, on the spot."