Traveling to Mongolia?

I am planning to go to Mongolia in the near future. Any advises you guys may have for me? how about the estimate cost to stay there for a month?
Update: Citizens of United States do not need a visa to Mongolia for a stay up to 90 days
Update 2: I didnt even spend 5k during the 3 months in Seoul man. It's hard to imagine that I have to spend 5k in Mongolia. My estimate of this is about 2k USD excluding the airfare since everything should be cheap there.
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