iPhone 5s inventories are said to be very limited at launch, according to reports from several different publications sourcing employees at Apple Retail Stores and cellular carriers. One source told AllThingsD that an unnamed carrier will have "grotesquely unavailable inventory" and another said they were disappointed with the shipments of the phone from Apple. BGR likewise said 5s supply would be "severely constrained". Mark Gurman claims three of four units shipped to Apple
