As far as I know, there has always been 20 episodes of the 1963-64 TV series 'Empire' available on the collectors market, most of them in black and white although the series was in color. The series -starring Richard Egan, but costarring Ryan O'Neal and Charles Bronson- was a great modern western that lasted only one season of 34 episodes, including the pilot. The big news, at least for me, is that someone has posted an episode, guest starring Keir Dullea, on Youtube, that isn't available in the collectors market. Here it can be seen in full.