I have a Garmin map of Brimstone, Coal Creek, North Cumberland WMA, and Pickett areas that I sell for $49.95. This includes area roads, county lines, topo, several boundary areas, hydro (lakes, ponds & streams), and many landmarks.
For more info, see...
http://cumberland-mudders.forumotion.com/gps-talk-and-information-f20/north-cumberland-trails-map-google-earth-version-t3956.htm ... 4-5 post down. It works with "x" models and many of the upper end models.
The Google Earth version is also quite useful...