Laut IMDB hat Avatar ein Budget von 230 Millionen $.
Wie kommst Du auf 500 Millionen?

In der Trivia erfährt man außerdem:
James Cameron originally attempted to get this film made in 1999 as his immediate follow-up to Titanic (1997). However, at the time, the special effects he wanted for the movie ran the proposed budget up to $400 million. No studio would fund the film, and it was subsequently shelved for almost ten years.