Greetings Harry,
I'm from Minneapolis originally, and still have many friends there. I'm a little unclear about what type of "shop" you seek, I think we have a little language barrier. Parts purchase, automobilia (car art and toys), vintage car dealer (do stop by Yesterday's Auto in downtown Mpls, 2800 Lyndale Ave South, 612-872-9733,
www.yesterdaysauto.com).
Or what do you have in mind?
If you're a little more specific, maybe this board could be more helpful.
Enjoy your stay in Minnesota! If you're there at the end of June, try and hit MSRA's Back to the 50's event at the state fairgrounds. Over 10,000 cars, albeit mostly pre-'65.
Tom Breske