What is the cost of traveling to the moon?

Depends on what you're sending. If you're sending a robot probe to just drive around and what not- even say to meet the requirements of the google lunar x-prize it'll cost about $100 million.

To send people, that's a different story. NASA's space exploration budget will be increasing from ~$5 billion to ~$10 billion per year over the next 10 years to fund to the return to the moon...