Space travel to Mars will cost half a million dollars

Elon Musk : entrepreneur
Land on Mars, a round-trip ticket - half a million dollars. It can be done.
"My vision is for a fully reusable rocket transport system between Earth and Mars that is able to re-fuel on Mars - this is very important - so you don't have to carry the return fuel when you go there," he said.

"The whole system [must be] reusable - nothing is thrown away. That's very important because then you're just down to the cost of the propellant.