Most Apple films are $9.99 apiece, unless they are a new release, in which case they are usually $12.99. Other sought after films gain a $14.99 price tag, as Gore's film has.
Amusingly, if you go the Movie channel in Apple's iTunes store, and select "$9.99 Movies", "An Inconvenient Truth" is included, with its $14.99 price.
So are a number of other titles, including "Babel", "Freedom Writers", "Glastonbury", "Jackass 2", "Jump In!", "Nacho Libre", "The Prestige", "An Unreasonable Man", and possibly more, all of which retail for $14.99.
So what is the criteria for being listed in the "$9.99 Movies" category, if not price? Is it arbitrary? Is it a bad script that just says (price ≠ $12.99)?
Whatever it is, it's fairly inconvenient that Al Gore's great documentary is included here, as potential buyers are turned away, seeing the quintessential movie of the generation on the environment remind us instead of waste - that of money.