I never said anything about a commercial vendor.
I said snuff films could very well exist, and by my definition, not yours.
Well, now, your unstated definition, eh? That could cover rather a lot of ground, eh? At the risk of repeating myself:
There is a legal word for a film depicting an actual murder--it is called "evidence".
I doubt very much that there is any actual occurance of a snuff film, by anyone's reasonable definition. You are welcome to contradict me with a concrete example.