All right, everyone out there that's already rocking a MacBook Air raise your hands. Right. Now, everyone planning on purchasing a MacBook Air in the near future, lets see a show of hands please. Okay then... not that many of you, eh? Still, for those of you that are willing to pay a premium for a smidge more portability than that you could be enjoying with either a 13-inch MacBook or MacBook Pro, we've got a tidbit that might be of interest to you: Supplies of the sliver-thin ultra-portable are dwindling at a number of normally well-stocked vendors, such as Amazon, MacMall and MacConnection.