Hi there,
From USA-AUS, I source mine locally, shipping companies from Sydney, Melbourne, Brisbane and Perth . This is for the big, bulky stuff such as Bars, Axles, Engine, Sliders etc.
Conversely you probably have to do the same.
BTW, why ECBs? The look is rather unappealing plus they're not as strong as steel bars. ARB is better IMHO. You could get side hoops fabricated there for nothing. It's just too easy there.
Where are you at? I'm heading to EJS at the end of March. SYD-LAX-SLC-CNY-SLC-DEN-LAX-PHX-LAX-SYD