Magsafe Adapter Shortage?

"Apple offers packs of 5 or 20 units or Magsafe adapters to its retailers. There are packs of 85W adapters for the 15 an 17" MacBook Pro, 60W for the 13" MacBook (and Pro), and 45W for the MacBook Air."

Now, however, they are only selling single Magsafe adapters in the 60W version so either there is shortage or they are focusing efforts elsewhere on the production end of things. They offer a couple of good points though, in case you need to get an adapter. For one, you can use a more powerful adapter to charge your computer, it will only use what it needs but using one less powerful will limit your charging capability. For example you are good if you need a 60W and use an 85W but using a 45W when you need an 85W not such a good idea. Same premise when it comes to the iPad and iPhone adapters. You can use the iPad adapter for either the iPad or the iPhone, but using the adapter for the iPhone to charge the iPad doesn't work so well, mainly because it isn't powerful enough to charge the iPad in a timely manner.