There are several episodes for sale on ebay at the moment.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1562122605
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1562123457
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1562124066
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1562124884
There are other places to buy complete video sets but I am unsure where they are at the moment.