Based on a recent trip to Bologna: there is a chain of Italian beauty shops called Tigota, and they stocked some but not all of the Proraso range, and also Prep cream. I know that some Italian cities have a "Casa dei Rasoi" (House of Razors) that will stock some DE razors, straights, and a slightly wider range of creams and soaps. The one in Bologna had a range of Antica Barbiera as well as Mondial, and Cella both in the cream and the big block.
Beyond that, it's worth keeping a look out for souvenir or hardware shops, as sometimes they will stock a few shaving sundries. I didn't look in any barbers shops, but ones that offer a shave might sell some products as well.
Pharmacies don't stock anything, but supermarkets had a reasonable selection of Proraso and Noxzema (in cans).
I expected to be able to pick up a stock of Proraso Blu on my trip, but couldn't see it anywhere. I ended up ordering it from the Italian website of a well-known internet retailer.