Same woofer as previously posted here: http://www.ozbargain.com.au/node/87342 though $50 cheaper this time.
Not the cheapest ever according to Camelx3 but I haven't been able to get subs shipped to Aus before.
You'll need a stepdown transformer which can be had from Ebay for about $20.
1- Your link is wrong as it is to your shopping cart
and
2- amazon.co.uk version = local voltage compatible, amazon.com version is 110v (e.g. not compatible without voltage adapter)