If you are trying save money by purchasing a MBA in $$$ rather than Euro / local currency. Be aware shipping charges are often exorbitant, and if they ship by courier you are pretty much guaranteed to be hit with import duty and vat, not only on the cost of the MBA but also the freight cost.
If you do have a apple online store in your country, it would be best o use them. At least you know the price you see is the end price, any other way and you are just gambling on hope you don't get caught by customs, or gets lost in transit....