I just bought the complete series at Walmart for $24.99. Good value. My only question is that it states on the "extras" for season three that there is the original pilot of 1963 but I checked the extras on the disc and don't see the original 1963 MFM pilot. I do see on the first season disc one the first episode titled "My Favorite Martian" that aired on 9/29/63. Is this the same episode?

The original unaired pilot with extra scenes is on Disc 5 of the MFM Season One MPI dvd as a special feature.

The season 3 special features has a "Lost TV show" pilot The Man in the Square Suit" that has nothing to do with "Martian". It was just a Jack Chertok pilot production that was never bought by a network.
Same for another Season One special feature pilot "The Reluctant Eye"

Thanks! I'll check it out now that I know where to find it!