You can only shop duty free when entering into your own country providing that you stick to the alloted volume. On atrip to Mexico I bought two 750 ml bottles of mescal and they only charged me $1.10 duty for one of the bottles and the other was duty free. I was ony there for two hours. On one trip from Canada I bought a bottle of remey martin at the duty free for eighty dollars the sme bottle I have seen in my local for One hundred and fifty. I recommend researching the prices of what you might want to buy and you will know the deal when you see it.