Some users got their MBA around the same time as the pre-orders. Others got them from the store, and you can see, many pre-orders still have not recieved them. Apple did a good job by not doing an all out release before most of the pre-orders were covered.
fair enough. anecdotal reports indicate, however, that some stores were only given demo units and less than a handful of salable units. most that were able to get an mba in store were successful in getting the store to sell them a unit, or an employee unaware to refrain from selling mba's until officially instructed to do so. additionally, white bags were used to conceal the transaction. yes, i'm aware a store had some fanfare when it sold its first mba, but that has not been the norm.
a sale is a sale, but as of tonight, the mba is generally unavailable.