The Dark Knight Rises won't hit theaters until July 20, but movie sites like Fandango are already selling advance tickets to Christopher Nolan's final movie in the Batman trilogy six months in advance, for IMAX screens only, on July 19.

The super-advance ticket sales are highly unusual even for a blockbuster Holywood film. EW reports that the last film to do such early ticket sales was James Cameron's Avatar. But even that film went on sale only four months in advance, selling out several weeks before the movie opened in theaters.

No chance of that happening with The Dark Knight Rises. As of this writing, the New York IMAX screenings were already sold out, and the Los Angeles and San Francisco theaters only had a few tickets left. These three cities were the only ones selling Dark Knight Rises tickets at the time, but it's doubtful Warner Bros., which has yet to comment on the early ticket sales, will limit them to these cities.

If you can't grab one of the last tickets at fandango.com for The Dark Knight Rises: The IMAX Experience in San Francisco and L.A., keep checking back on the site and other ticket sites in the weeks to come, as sellouts are sure to be frequent.

I can tell you the truth because I'm done with it. I felt immense pressure! Nolan has said of the final Batman movie. And I think it's a good pressure, because you owe it to the films, and the people's expectations, to make it work.

With the fan base behind Batman, and the movie hype behind Nolan and Christian Bale's final Batman film, those who aren't prepared to look for months in advance are likely to find themselves seeing Dark Knight Rises the next week in July, not the opening weekend.

The Dark Knight, starring Heath Ledger as the Joker, holds the No. 2 spot for best opening weekend thanks to the $158 million it brought in in 2008. The Dark Knight Rises, featuring Anne Hathaway as Catwoman and Tom Hardy as Bane and billed with the slogan, The Legend Ends, is looking to break that record wide open.