Harvey Korman's appearances on Jack Benny Program

[harveykormanfan]

Hello.

I am looking for Harvey Korman's appearances on the Jack Benny Program. The first appearance aired in 1964, and is called Jack Loses a Raffle. The second appearance is called Jack Brings Ed Up from the Vault, and aired in 1965. His last appearance is called Jack Has Dog Trouble.

Does anyone know where I can watch or buy these films?

Thanks!

Sara