^If anyone still hasn't backed theirs up, I made a video on how to do that. Even if you don't plan to delete it, PS4s can break, hard drive errors can happen, etc. so I have mine on a flash drive now so I could always reinstall if I want to.
That's what people were listing them as. I don't think anyone is actually buying them though. They actually banned people from selling them last I checked.
It's possible that they are still selling elsewhere, though. I wouldn't buy one even if I didn't have it and did have that kinda money to throw away, because I think it's also against the PSN TOS to transfer your stuff. I'd be afraid they'd deactivate my access to it anyway or something. The whole thing is insane anyway.