Thanks all. It appears Ikigai in Melbourne also do E6 for similar rates. They actually have a presence in Tasmania (dropoff/pickup deal with a cafe) which would be convenient, alas it's at the other end of the state to me. Oh well, Australia Post exists...
I'm about to get set up for C41 developing (sous vide bath etc.) so the technical and temp control side isn't so much of a consideration. And to be honest the cost of an E6 kit isn't much more than a C41 one, it's just more the shorter working lifespan of colour chemicals. With colour reversal film being seriously expensive these days, often hard to get hold of, E6 dev being allegedly easy to mess up and somewhat pointless over colour negative film within a hybrid digital workflow (at least in terms of my own use and needs) the high likelihood is I won't get through enough slide film to make it vaguely worthwhile, let alone cost effective.