It’s never too early to start buying Christmas presents…or ordering movie tickets.

Avatar is not even scheduled to open for another four months, but those eager to get good seats can guarantee their spots now. AMC has already begun selling tickets to midnight showings at 75 theaters. Most of those locations are IMAX venues.

James Cameron’s 3D sci-fi entry received good worth of mouth after an extended preview on IMAX screens last week. (You can view a teaser trailer here.) It was this overwhelming interest that prompted the theater chain to begin advance purchases.

“They said that if all these people are going to come to our theater to see 16 minutes of a film that doesn’t open until December, let’s give them an opportunity to buy tickets to the first performances of the show itself,” Chris Aronson, Fox’s Senior VP of Distribution, said.

Since the film’s running time hasn’t been confirmed, only midnight viewings are available at this time. Avatar opens on December 18.