Program material for demos?

[dtvmcdonald]

This is somewhat off-topic here, but clearly this is the place for answers.

I'm looking for old material to display on my CT100.

I want the earliest color videotape material I can find on DVD. I have
not been able to find on Amazon much if any early material.

I tried getting a collection of old Johnny Carson stuff 'cause it was
cheap and I knew ithe show was color from at least 1964. Unfortunately all
the really old material was B&W kinescopes. The earliest color
material was from about 1968 or 1969 and looked as expected
for that time period, on my big screen TV via HDMI. I never
found a good +Q -Q transition but his curtain has a nice +I -I one which
looked great.

SUGGESTIONS?