This includes all 51 episodes. The cheapest I've seen the 2 individual sets for is 22.99 during the holiday sales last year, and this set is currently 49.99 at amazon. The release date is Nov 20, 2012.
http://www.rightstuf.com/cgi-bin/catalogmgr/30I1fSqCs$$$FE9Vmq/browse/item/96144/4/0/0...