Hello all, I'm from Brazil and I'll be traveling to California in a couple of weeks. I want to buy the 11" MBA, but I want to upgrade it to the i7. Is it possible to find it on an apple store? I will visit Los Angeles, San Francisco and Las Vegas. I even tried buying it on Macmall.com and have it shipped to a friend in the US, but they won't accept payments from outside the US. Any thoughts on how can I get my hands on this machine? Thanks.