Hi, I will be back from Poland to Italy on the next weekend and I will cross South-east Germany, mainly Nuremberg and Munchen; could you suggest me a couple of gun shops that are supposed to be well-stocked in riflescopes? Thanks.

Frankonia of course. There are about 18 of them, here's a list of towns that have them:

Berlin
Bexbach
Darmstadt (very nice one)
Dortmond
Dusseldorf
Erfurt
Hannover
Kassel
Koln
Magdeburg
Munchen
Nurnburg
Rostock
Stuttgart
Wurzburg (this is the big outlet, I think)

They have a very bad attitude: I sent an email to the Erfurt and Munich shops 2 days ago; I asked about the availability of a couple of scopes, stating that I was eventually ready to buy. Still no reply from Erfurt and the Munich shop erased my email whitout even reading it.

I would just drive up there and buy it. They are much better stocked than the shops in Spain and Italy.

Not sure, but maybe Switzerland has them cheaper?

Switzerland is not part of the EU so there may be a tax issue in crossing borders.

Only if you get caught!