Gee, if only I could get it cheaply to Australia!
Find out how much it weighs and check with Quantas or other air carriers to find out how much it would be to send it air freight. Also find out how much it would be if it was part of your "luggage". Might be worth a round trip flight to the US.
And I know the following may sound silly, but...... I knew a guy who had to regularly fly with many (10-15) large cases (say 2ft x 2ft x 4ft) of film and video, lighting and audio equipment 20 years ago. He told me that he'd load them all up in his small truck and head for the airport. He'd go to the curbside baggage checkin and ask one of the baggage handlers for help. He'd tell him what flight he was on, open the back of the truck, ask if he could get these checked onto the flight, and then hold out a $100 tip. Nine times out of ten, he said the baggage handler would check them all in and he'd not be charged anything additional. Might not work today, with all the security requirements, etc, but it worked for him back then.