Apple stores don't advertise upgraded MBAs for sale. They only list and display the 2GB versions. But, some stores do carry upgraded GB and Ghz models. I asked my local Apple store tonight and they had an 11" MBA with 1.6ghz and 4GB. The first Apple rep didn't even know they carried the 4GB version. I asked the manager to check in back and the "stock room manager" walked out with an 11" MBA listed at 1.6ghz and 4GB. It was awesome! I asked if they had other upgraded MBA and the stock room manager said they did carry a few different models.