Best Barolo and Barbaresco not distributed in the US?

I’m going to be visiting Florence, Bologna, and Rome in a few weeks. Despite not having the time to make my way to Piedmont, I would still love to pick up some interesting Barolo/Barbaresco. Does anyone have recommendations of wine shops or sources for difficult to find in the US wines? I would prioritize traditional producers, and would prefer fewer bottles of exceptional wine (even if expensive) than more bottles of very good wine given the limited number I’ll be able to carry back. Any particular producers I should look out for? (Would love to track down some Bartolo Mascarello, but sounds like that will be impossible.)