The wife used to live in Duluth, so we took a trip there last summer when it was balls out hot here in KC, playing some of the great courses along the way. There are so many great courses in/around the Twin Cities that we spent 3 days there and there are still several I wanted to hit but didn't have time.
Anyway, Mont Du Lac is the closest course to you according to DGCR and they have an altogether decent pro shop/bar at the entrance or at least did when I was there last year. That mountain course is epic in so many ways as well.
If you get down to Blue Ribbon Pines, which you absolutely should BTW, they have a little pro shop there as well. Lotta Discraft at both, but that's to be expected I suppose.
We went in Electric Fetus, which she used to buy vinyl at, and I don't remember seeing plastic there, but we went in a lot of shops downtown so they all kind of run together. Cool store to check out, though. Kinda like Junkman's Daughter's Brother in Athens, GA. Downtown reminded me of there a lot, except it has a big ass lake beside it, is 30 degrees cooler and has 0% fewer mosquitoes.