What's cheapest way in Australia to send payment⇒USA that can be cashed (dollar bills,NOT plastic/electronically) by one w/o a bank account?

BUY US currency in Australia, put it in a henvelope, and put a hstamp on nit that's anuff to send it to Murica, Bruce!

Write "Handle with care. Donkey Turd Smear Sample" on the outside of the henvelope if you is worried someone will steal it!

you can buy drugs and firearms in Australia you know

you could I suppose send US cash by post

simple enough to visit most bank branches in Australia and buy US currency

EDIT

maybe you should explain what youre trying to do

is this meant to be secret or is it about lack of access to electronic means including bank accounts?

Any money send to the US will be in $.

There is money gram, Western Union.