How much does a house on the moon cost?

Inquiring minds want to know: what is the approximate price tag attached to acquiring a property on the moon? Is there a standardized real estate market on our natural satellite, or are the prices negotiated on a case-by-case basis? What factors determine the cost - the location, proximity to lunar resources, or perhaps the novelty of being the first lunar homeowner? And with the current advancements in space exploration, is purchasing a lunar home becoming a realistic possibility for the average citizen, or is it still reserved for the ultra-wealthy and space enthusiasts? Answers to these questions would surely be fascinating to learn.