If you are located in USA, I would suggest that you buy a good one over there and import it to Oz. Although you will have to pay freight, GST etc, you will end up with a far newer and tidier aircraft and have a wider choice to buy from. Just make sure that you get thorough checks done on what you are looking at over there, as you would have to do in Oz anyway. Also make sure that any outstanding requirements for the type have been done and checked off, eg, SIDS etc.