I recall seeing an episode of Biography on A&E on Lee Marvin, and there were sharp-looking clips from M Squad, but I'd guess the tape transfers of the entire series were destroyed in the 2008 Universal fire!
Anyone for Mr. Garlund from 1960-61, starring Charles Quinlivan and Kam Tong, who took the season off from HGWT, except for two episodes. Didn't last all that long, not even the 13-episode minimum.
Encore could foot the bill for a couple of Warner westerns, Colt .45 and Temple Houston. CBS should do new HD transfers of Have Gun Will Travel's earlier seasons 1-3. I'd love to see M Squad from Universal remastered and streaming online somewhere!