Major retailers have been selling out of Apple's MacBook Air. After a full month of being on the market, the MacBook Air is still selling strong with is still difficult to obtain in some retail channels. Apple currently has an additional 5-7 day wait time on new orders, and Amazon has stated that they will not being shipping new units until March 16. The causes for the short supply was not stated; however, Ars noted that stores receiving stock often sell out the same day.