To add to list of eBay deals ( https://www.ozbargain.com.au/node/397912 ) that might be worth checking. The router can be bought at $143.20 using the promo code PARENT. It's in the list of compatible FTTN NBN routers from Whirlpool http://whirlpool.net.au/wiki/fttn_registered_modem_router , and pretty popular among the Whirlpool users based on the threads I've read.
Edit:
Please note the eBay listing doesn't indicate if it's a V1 or V2 version of the product. (See comments below) Both versions are in the Whirlpool list of FTTN compatible routers
Before buying, please call your internet provider ask about the router's compatibility with their service.
It's $100 at EB Games, though not available in all stores and is supposed to be V1 (yet there are comments about people actually receiving the V2). Officeworks was however happy to price match the V2 for me a few weeks ago.
Also, I wouldn't purchase the one in that eBay listing without first confirming it's the V2 variant since the listing doesn't specify.