The albums can be downloaded here:
http://www.downhomeradioshow.com/2008/05/traditional-music-from-the-cumberland-plateau-vol-1-2/

A recent post on the page says that County has the albums (out-of-print) for sale @$8, but I couldn't locate them on the website http://www.countysales.com/ so you may have to contact the company directly.