Something on youtube can't be very "lost" but I would like to own a copy of this. It's a very strange film. Copies were pulled from circulation after a copyright dispute.

https://youtube.com/watch?v=UobR9pvRJRE

>  Banned by the Carpenter estate, Todd Haynes' experimental biopic Superstar: The Karen Carpenter Story (which uses Barbie dolls to narrate the tragic life of the American singer) has become a cult hit because of both its controversy and its rarity.