Sorry if this has already been posted.... I'm getting ready to buy the new 13" MBA (base) with 8GB RAM upgrade. I realize that the RAM is built-in which makes it BTO, but are any Apple Stores carrying this configuration or is the online order the only way to get one like this? My local Apple store has two 13" MBAs - the base (without processor, RAM or SSD upgrades) and a 13" with all the possible upgrades (2.0 i7, 8GB RAM and 512GB SSD). Are stores only carrying these two configurations?