Now Golden Spike has started to sell trips to the moon. It is now business for private companies, no longer business only for governments. Price is set for $750 million and I guess you can make your reservation already. There are two seats available for 2020 flight.

More information:

Golden Spike: http://goldenspikecompany.com/

Washington post: http://www.washingtonpost.com/national/health-science/golden-spike-space-tourism-company-to-the-moon/2012/12/06/52eedcc8-3fc3-11e2-ae43-cf491b837f7b_story.html

Youtube: https://www.youtube.com/watch?v=6hoSSmW27xs