I got an MBA, 13 inch, 4/256 as a gift for Christmas. I am VERY happy and grateful - but I would love to upgrade to 8gb ram and would be willing to pay the difference to do so. I won't be able to buy a computer for a long time so I'd like to get a bit more mileage out of it as far as OS upgrades and whatnot while it would only cost me a little bit to do so. The only problem is the person that bought it for me bought it at Best Buy and I don't want to hurt her feelings or appear ungrateful. She also kept the receipt, obviously. I know this is a very long shot, but I haven't even taken the shrink wrap off the box yet - is there ANY way at all I could somehow go to the Apple store and trade it in for the same thing, just with 8mb ram and pay the difference without the receipt? Or is there some other great idea where I can get one with 8mb somehow without the gifter knowing about it? Thanks!