You don't have to go there, They send it to you.
Postage and handling US $7.99
Anyway, I'm a part owner of a piece of Mars already.
Go here to view it.
http://www.seti.org.au/spacerock/
It arrived via "Air mail" about 8 months ago, and went through the roof of a house in Brisbane.
It is having it's final and most critical, Oxygen 17 and 18 isotope testing at the moment, and should be finished by the end of this Month.
All tests so far point to Mars as its origin. But the Isotope tests will be the final proof.
Mike.