You can find Bill Alexander's videos on YouTube as well, but they aren't as popular as Bob Ross's.
Doesn't oil paint itself last forever? I'm not sure, since I've never painted. When I was a kid, I always wanted to buy some oil paints and paint along with Bob Ross, but my parents couldn't afford it. Then once I move out on my own, well, I just never got around to it. I've told my son if he continues to be interested in art, I'll buy him some eventually, so maybe I will find out eventually for myself.
It's pretty crazy how these people who predate the internet have become popular these days. I wonder what Bob would have thought if you'd told him one day kids in Japan and other countries would be watching his videos and that his name would be known worldwide.