Good luck trying to buy anything that isn't hardware from Apple right now. The company recently confirmed on its services status dashboard that the iOS and Mac App Stores, as well as the iTunes Store, are "unavailable for all users." The silver lining? Some people might still have luck picking up some new reading from the iBooks Store, but we wouldn't count on it. Don't be fooled, either: For now you can still sift through the stores' wares and listings as though nothing happened, but you won't actually be able to purchase anything. The first spate of issues started making the rounds at about 5AM Eastern, and Twitter's slowly been swelling with confused, clamoring consumers ever since. At time of writing, Apple hasn't yet said how far along it is in the recovery process, or when users can expect to access the stores once more.
Update: Service appears to be fully restored, check for more details after the break.