I don't know about demand but I did buy a 60L variant from rotomoulding in WA 30 $308 including shipping. I was after a SS conical but couldn't justify spending that much $$$.
my only gripe with the plastic conical, though not a big concern is that the lid is not air tight which means I don't get to enjoy a bubbling airlock. It is good being able to pour off and fill a decent jar of slurry for the next brew as well as removing excess **** from the cone prior to kegging.