Found this sweet deal from Amazon.com with shipping to Australia. These drives are USB 3.0 and internal drive is a segate ST3000DM001. specs on that drive is 7200rpm, 64MB cache .
The cheapest deal for 3TB USB 2.0 on staticice was A$216.00, so you save approximately around $100 (depending on exchange rate)of a single drive and you get a better spec.
Also available is
Seagate Expansion 2 TB USB 3.0 Desktop External Hard Drive STAY2000102 for $79.99
Mod: Unexpired 13/9
I think this is an even better deal than the centrecom one because of the USB 3.0. OP you sure this is available in Oz?