You could buy
You can buy one of the following:
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Acre of the Moon
Cost of an acre of the Sea of Tranquility, from the Lunar Registry for US$37.50 (CLP18,770) from source
Shopping list
You can buy all of the following:
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1 A speck of dust made of anti-hydrogen gas
A speck of dust made of anti-hydrogen gas for US$0.05 (CLP26.65)