I have a payload that is the size and density of a grain of sand.

I want to land it intact on the moon, but I am not particular about location beyond that.

What is the least expensive way to get it there?

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    $\begingroup$ Would Space Exploration be a better home for this question? $\endgroup$ – Emilio Pisanty Mar 24 '14 at 16:42
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    $\begingroup$ Is this theoretical? because if you are actually wanting to send a grain of sand to the moon, I'm intrigued! :) $\endgroup$ – Adsy Mar 24 '14 at 16:48
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    $\begingroup$ what-if.xkcd has a few columns on the Rocket Equation: en.wikipedia.org/wiki/Rocket_equation . Short answer: the payload is a nearly-inconsequential contributor to the total mass required to escape Earth's gravity well. //// I'm tempted to say the cheapest way is: Wait for a bigass meteor to hit the Earth, ejecting your sand grain into space :-) $\endgroup$ – Carl Witthoft Mar 24 '14 at 17:31
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    $\begingroup$ @Adsy: I'm thinking about unconventional solutions to the YouTube moon prize. $\endgroup$ – John Shedletsky Mar 24 '14 at 18:30
  • $\begingroup$ In a lot of ways this is a technology question, rather than a physics one. Also, it seems to me that you'll get vastly varying answers, most of which without much objective evidence to back themselves up, considering the complexity of the mission at hand. $\endgroup$ – David Ball Mar 24 '14 at 20:57