The problem is subs are big and heavy, and therefore expensive to ship. I'll list the frontrunners here in the states, and leave it up to you to find out what can be shipped and for how much. My personal favorite is Rythmik, because I really like tight, controlled bass that sealed servo systems offer. But others to consider are HSU, PSA, SVS, and Outlaw. I might have left someone out...but as I said, post in the Subwoofer section, and list your room dimensions and listening preferences, since that matters a lot with subs. Be sure to mention your location also...maybe you'll be lucky and a fellow Aussie member will have some inside knowledge.