It’s still fairly early in the morning on the east coast of the US-- most of the people who can answer your question are probably still asleep.
I am absolutely NOT the right person to answer this, but want to ask a question:
Won’t transportation to and from the US eat heavily into that $6,000 per year? Would it make more sense to consider schools in a country that’s much closer? I know nothing about the Australian system, but geographically I would imagine it would make more sense.