Hmmm.

Can one buy helium in serious quantities in Melbourne? There are lots of party hire places that will rent me a helium bottle for an afternoon, ostensibly to fill up my balloons, but dammit, I want my own bottle. On tap, as it were. At least, I think I do, eventually.

Thoughts, anyone?

Ah!
nigelw, I'm looking at you. Apparently, divers use helium. Possibly only deep divers, though - google is as yet unclear.

sol.
.