For the month of July, Apple is running a new offer on the iTunes Store. In addition to weekly discounts on HD films and the reduced-price rentals for the movie of the week, the company is holding a Blockbuster July sale, which offers a different movie for $4.99 each day, for one day only.
The sale started with Pineapple Express, which is actually still available for $4.99 at the moment. As of this writing, the movie on sale is Dances with Wolves starring Kevin Costner. That film is also available for a $3.99 rental, in addition to its $4.99 purchase price.
Be sure to check back on the iTunes Store throughout July to see what movies Apple offers as a part of the sale.