i will try to tell you a secret tip for asking discount. Ask open ended questions. For example, avoid asking, “Do you offer a discount?” The obvious answer is, “No.” Instead say “What is your discount for…” ?? as it requires more of an explanation:)))

Tax free is only possible when there will be any Tax free Foreigner Tourist policy of European Govt. This is how you will ask the shopkeeper/owner directly that:- Is there any FOREIGNER TOURIST TAX FREE POLICY?

Simply ask:- Do you have some discount or some relaxation on tax?