Through the power of Google, I found a few estimates on what it would take to get to the moon. They ranged widely. In 2005, a private company estimated that they could send you on a roundtrip fly-by for $100 million, and another private company figured they could land on the moon for $10 billion. My idea doesn’t have to be a manned mission, but it does need to actually land on the moon and erect a monolith.
The only erosive forces are solar wind and micro meteors so it wouldn't have to be anything even close to solid rock to last thousands of years.
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