Caridwen - I think the lack of help has something to do with some references to using these devices for other things and no one wanted to go there. Then OP changed his request, decided he wanted a ProVari and even then puts into another post a device that shouldn't be mentioned on this forum.
Since OP posted from the Provape website, OP knows where to get a ProVari.
Since OP posted from the Provape website, OP knows where to get a ProVari.
As I am unable to suggest suppliers, I was really hoping that one of the many ProVari owners could have offered you some suggestions on what you needed.
Sadly that wasn't the case. Hope what you did purchase works out for you. I'd post in the link I posted earlier and you may get a little more help.