I know a guy is Brisbane North side that could probably set you up at a good price. I will give him a call tommorow (If I remember)
I think he sells kegs for $70 reconditioned new seals etc etc. He's where I got most of my kegs and gear from.
I have a 5kg fire extinguisher absolutely mint , tested dip tube removed and filled for $143.....Contact your nearest fire tech mob to see if they have some lying around.....