$5b incremental cost to do a moon mission, probably, for SpaceX in a few years. $10-20b to do Mars Direct. That's not incredibly far off from a major video game or movie franchise.
I mostly just made up the moon number, based on it being a whole lot easier than Mars. I think you could probably do a recreation of Apollo pretty cheaply (a quick flight to the moon, simple landing, etc.). Certainly a trip to the moon without landing wouldn't be THAT hard once you had a rocket able to escape from earth gravity (maybe 2x as hard as launching to GEO?). You could maybe do it with a Falcon 9 in a single launch, so that's about $2b. It's less fun if you don't land, though.
pretty cheap when you put it next to a bank bailout
Another inspiring TED talk.
I could see it working. "SpaceX: Mission to the Moon". Then reedit it into a film when done, sell that with merchandise and begin the "SpaceX: Mission to Mars" series.
It should be called "James Cameron Goes to the Moon."
The movie is about James Cameron trying to go to the moon, but he is constantly sabotaged by the bad guy from Aliens. Ultimately, he succeeds and gets to the Moon. The last 30 minutes are just sweet, sweet HD shots of the moon, directed by James Cameron.