There is no problem to buy Windows retail box in a online store outside your country no ? I mean , more than you will be probably stuck with English interface, but no problem to activate it or with licensing , no ? Is because i have found (hope this will still be like today a few more months) great offers in some online stores , for windows 7 pro retail full box and also ultimate too (retail full), so good that it is cheper buying it to a outside country than in spain. (i could save at least about 90 $ compared to price here) I have to be a month saving for buy it , but if in a month the prices are like now , i think i will buy it in a online store.

Shouldn't matter where you buy it. It should still activate as long as it is a genuine copy.