dydx there will be some transmitter testers in your state. In Victoria I believe most clubs require you to have your transmitter tested before you can fly at the field. My friend in Melbourne said it cost around $20-$30 and needs to be retested every few years depending on the club.

Airtronics are great radios from what I have heard. However in Australia they go by the name of Sanwa. I wanted to buy a Sanwa VG6000 however was told not to because of the fact there is no Sanwa service centers in Australia and also not many people use Sanwa. I wanted to join a club and have a buddy cord and the chances of the instructor having a Sanwa too was very small.

O'Reilly Model Products in South Australia are a full blown JR service center. I also know of a Hitec service center in Melbourne.