Buy an N600 Wireless Dual Band Gigabit ADSL2+ Modem Router (TD-W8980) in the applicable period (now until 31st December) and you can mail in to receive a free N600 Wireless Dual Band USB Adapter (TL-WDN3200).
Seems like a bargain to me! I was needing a new modem and had already decided on this model after reading some good feedback on Whirlpool (http://forums.whirlpool.net.au/archive/2038380) and it was the cheapest dual band modem from MSY, so the freebie is cream on top for me.
There is a sticker on the box states 'Ready for NBN'.
I bought the modem from MSY for $108, which was one of the cheapest retailers (http://www.staticice.com.au/cgi-bin/search.cgi?q=w8980&spos=…), you might try your luck price matching -5% at your local Office Works store. The free USB adapter is RRP $49, but sells for around $25-30 (http://www.staticice.com.au/cgi-bin/search.cgi?q=WDN3200&spo…).
Downside: You have to send in the ORIGINAL receipt & serial number cut out from box (they send back original receipt with the freebie).
Promotion details:
http://www.tp-link.com.au/common/Promo/au/au-8980-promotion/
Product page:
http://www.tp-link.com.au/products/details/?model=TD-W8980
Review:
http://www.goodgearguide.com.au/review/tp-link/td-w8980_n600…
http://ple.com.au/ViewItem.aspx?InventoryItemId=612147