I bet either Jungle Jim's or the guys just as you go in to Findley Market you know, not all the way into - across from the little Italian place - could get you what you wanted.
I haven't tried Jungle Jim's meats, so I can't say anything about them. There's a great butcher on the east side, Summit Meats. I've never looked for dry-aged, but the stuff I've had is phenomenal. There are also a few butchers at Findley Market worth checking out.
Sorry, Bob, I'm not sure there is such a thing. Avrils on Court Street gets local fans but if yoy're looking for a New York or Chicago type butcher I haven't found it.