28 seasons and a few movies on DVD.
TOS: all (not the new remastered)
Of all the packages, ENT seems to have the best extra material. Not only does each season set end with special features and interviews, but some episodes are available with audio commentary. There are also deleted scenes for some episodes. At first I did not think I would like the audio commentary but they proved interesting.
I have some of the early movies and a few TOS episodes on VLD. That's Video Laser Disc for the young crowd. Think 12 inch DVD. The only blue ray is the latest movie, due in a few days from Amazon.