Start visiting scrap yards, amazing the stuff you can pick up. My treasured 18 gallon keg came from a scrap yard. Plus lots of ss stubing, valves, copper piping etc.
or go aliminum its legal and search fro a old thread on it so for about $80 u can get a 60 litre pot then buy same ball valves ect light to lift easy to clean..
And brewers in adelaide i may bee soon selling my legal 45 barrel keg kettle as i will be going to ali :chug: :chug: