James Cameron does many things, but he doesn't do them cheap. With production gearing up to get underway soon on a trilogy of "Avatar" sequels, a new report at Variety has heard estimates of the budget for the trio of films will come in at around $1 billion dollars. 20th Century Fox chairman and CEO Jim Gianopulos however says a final production budget hasn't been set yet. It sounds like a risk, until you remember the first "Avatar" film made $2.7 billion worldwide.