My first suggestion would be a butcher who serves an Italian-American trade. They're frequently used to make spaghetti sauce. I just got some at Joseph's on Irving Park for about $2 a pound. Meaty and wonderful looking.
I saw some in the meat case at Produce World in Norridge just last week. Maybe the one on Dempster might have them too. They didn't look as good as the ones from Joseph's. Also about $2 a pound.
And I'd like to mention how wonderful the meat cases at Mexican-American groceries look. There always seem to be actual butchers on duty, and in my experience at Tony's on Elston they're always happy to be helpful [altho I have a language barrier to deal with]. Wouldn't be surprised if they had them, along with dozens of other Mexican stores.
And then there's Chicago Meat on Cicero near Sol de Mexico . . . .
Giovanna
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"Enjoy every sandwich."
-Warren Zevon