Actually for unimproved land in Oklahoma, you can find it for much less than what the others have indicated. Of course, location is always key. But if we are talking about all throughout Oklahoma you can find unimproved land for between $600-$1500 an acre. Also, the larger the land, the less you'll most likely pay per acre.
I'd love to help you if you are in the market for some Oklahoma land. Feel free to contact me with any questions.
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