Which state has the CHEAPEST real estate market?

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Just curious which state has the cheapest real estate market.

For example, in Minnesota if you were to buy 40 acres of vacant land you could expect to pay at least $60,000 (unless it's all field, then maybe $45,000.)

So which state has the cheapest land and house real estate market?

I would have thought it would have been Montana or something because the population is less dense, later did I find out that Montana is a lot higher than Minnesota is!