dave if you can get over your aversion to dvd's thundarr the barbarian has been available on made-on-demand dvd from the warner brothers shop
http://www.wbshop.com/product/thundarr the barbarian- the complete series %281980-82%29 1000180186.do?sortby=ourPicks&refType=&from=Search
I too would love to see once and again and sisters available to watch and/or purchase!