Unfortunately, this product is not available in Australia…. legally…
An interesting read about discussions about trying to source it, that I came across on a forum.
http://www.ausaqua.net/index.php/topic/10433-flubendazole-where-to-get-it-in-australia-or-nearby/
But not to fear. There are some other veterinary drugs available such as praziquantel, trichlorfon and formalin that I have at my disposal to treat for flukes.