Not to speak for others, but William Dicks above says he sold his for $13k/nra ($26k/nma) to guys named Cazadores in July. After research and a multi-month process. In sec 29 of 48 8. Not sure if recent falling oil prices have affected the going rate or not.
Remember to have any contract to sell your Minerals professionally looked over, as they sometimes take all your Production in the Small print. It’s a costly error selling minerals. So please hire a Lawyer to make sure your only selling what you think you want to sell.
Chris