I'm guessing you've tried the obvious...
If so, try
Roberts Hard to Find Videos from Canada.
They have it on DVD for $9.95:
https://www.robertsvideos.com/browse.php3?alpha=EI've used them to get a copy of the Skyraider-themed episode
(The Admiral), of the old
Bob Hope Chrysler Theater and Groucho Marx's TV version of his play
"Time for Elizabeth" (also from the Hope series). That is his last starring role and a good addition to a collection of Marx films.
Very good service and to fill up space on the DVD-R, they added a couple of extra episodes from the anthology series as a bonus.
They have
everything.
This reminds me, I've got to order the pilot for the McHale's Navy series. Believe it or not, it started out as a drama and explains the reason why McHale's crew were renegades...they were the sole survivors of their PT boat squadron and were fed up with war.