The Moon is not for sale. The Outer Space Treaty, an international agreement established in 1967, prohibits any individual or country from claiming ownership of celestial bodies, including the Moon. This treaty has been signed and ratified by a large number of nations, including all major space-faring countries.
The Moon is considered a common heritage of humankind, and its exploration and use are meant to benefit all of humanity. While there have been discussions and proposals about potential commercial activities on the Moon, such as mining or tourism, the legal framework currently in place does not allow for the sale or ownership of celestial bodies.
It's important to note that the cost of lunar exploration and scientific missions can be quite substantial, involving advanced technologies, spacecraft, and scientific instruments. However, these costs are typically associated with research, space agencies, and international collaborations, rather than purchasing the Moon itself.