The 2014 refresh of the 13.3-inch MacBook Air is hardly worth writing home about, which makes picking up a 2013 model all the more attractive, if you can hunt down a good price. I'd say $849, including delivery, is an excellent deal, though you only have today to take advantage of it.
Dick Smith's online store currently has the notebook going for this tempting price, but the discount is only valid for 21 June, so you don't have a lot of time to ponder your choice. While not everyone is enamoured by Apple's hardware, it's hard to argue that the Air is one of the better ultra-portables you can get. Even if you're not an OS X fan, you're free to install Windows via Bootcamp.
A tip of the hat to beebafeeva over at OzBargain for spotting the deal, just one of many Dick Smith has today. Just be careful viewing the main page... there yellow/black/white striped background it has going is not easy on the eyes.