Apple has added a new section to the iTunes Store highlighting cheaper, $9.99 HD movie offerings. The new page currently features 30 movies, including the Oliver Stone films W. and The Doors, as well as American Psycho and War. Notably, several of the movies are priced as low as $5.99, while other titles share their $9.99 HD pricing with their standard-definition versions, giving customers little reason to prefer the lower-quality SD copy when all…