I got mine from ebay. All the guy would do is go to the bose shop, by them then ship them to the U.K. and because he stated a low value on the package I didn't get charged duty on them. So it turned out a good deal for both of us, saving me about £100.

It is a good way of getting them, plus your sister is a far more reliable source as long as she doesn't put the full value on them.

I am going to NY, end of March I would offer to get you some but going hand luggage only.