Agree with Tony.
Depends where you are going.

Prices are much cheaper in Europe.
Even duty paid!

The wine selction is impressive, but expect to find some bottles at up to 1/3 of the price in Carrefour in France!

Beer is a complete rip-off (S$ 2 or more for a can they get wholesale for about S$ 0.30)!

Tabacco is cheap. But in this field my expertise is limited.
10 packs of Marlboro at just over USD 10.