Vast majority of MST3K shorts are on YouTube!

[tzikeh]

Get 'em before they're gone!.

Personal faves:

Design for Dreaming ("Conspicuous consumption makes our love stronger!")
Circus on Ice ("Hi, prophase!" "Hi, anaphase!")
Johnny at the Fair ("Jiminy, thinks Johnny, if only I could get a ride in one of those!")

And -- the winner and still champion -- Mr. B Natural ("You know, I think Oscar Wilde only wished he were this gay.")