Last I heard, they were going for around $25k. That was a few years ago though. https://www.simtable.com/
Forest Service and Bureau of Land Management public lands that could be offered up for sale. (This is a screenshot. Map is interactive and don't forget to look at Alaska.) https://wilderness.maps.arcgis.com/...x.html?appid=821970f0212d46d7aa854718aac42310
