Along with what UCLA has posted, the rights holder Paulist Productions has put up a large number of the episodes on its youtube channel. I've already spied episodes with the likes of Julie Adams, Bob Newhart, Anne Francis, John Astin, and of course the episode you mentioned. I'm going to have to...
The rest of Petticoat Junction
The rest of The Beverly Hillbillies
The rest of The Jack Benny Program
The rest of Our Miss Brooks
The People's Choice
The Bob Cummings Show/Love That Bob
The Lawrence Welk Show
All of the Disney programs that Darby mentioned
More of the original...