Hi Domn, we normally import our bettas from places like Thailand off Aquabid.com and go through someone aka someone who is our transhipper. You need to check the seller on Aquabid ships/sends bettas to Australia. Once you purchase the fish from a seller, you need to let their Transhipper know and let someone know. The bettas are quarantined upon entry into Australia (which attracts a fee) and then are couriered to our door.
There should be more info about this in this thread http://ausaqua.net/forum/index.php?showforum=37