For a 6kg cylinder I pay about $130 per year in rent and about $35 a refil I think (never had one yet).
Project for next month is to ring around Perth and find a CO2 extinguisher like others have in other states. The deals some of the brew shops over east offer seem very good and if we could get them over here I wouldn't bother with looking for an extinguisher ... unfortunately it seems BOC & AirLiquide screw us over here. :angry:
Ultimate air a selling cylinders that can apparently be filled by Chubb but at $300 for a 2.5kg it is a bit steep for me. Hoping to get a 6kg extinguisher for much less, if I find one I will post so other Perth brewers can use it as a reference (unless someone has done it already!).