Conversation so far:
When was the movie Avatar released?
Intended for release in May 2009, Avatar eventually premiered on December 18, 2009
What is James Cameron's role in Avatar?
James Cameron was the writer, director, producer, and co-editor of Avatar
Who starred in the movie Avatar?
The cast includes Sam Worthington, Zoe Saldana, Stephen Lang, Michelle Rodriguez and Sigourney Weaver
Did Avatar win an award?
Avatar was nominated for nine Academy Awards, including Best Picture and Best Director, and won three for Best Art Direction, Best Cinematography and Best Visual Effects

Question: how many copies were sold
Self-contained rewrite: How many copies of Avatar were sold?