Occasionally I check the Webjet application (on my iPhone), the app is easy to use. Flights change often - their prices, dates and times are updated super-fast.
Last year when I first installed and registered the app, I also subscribed to their newspaper and I have received 'Daily' emails of great airfare prices, hotels, motels, cruises, theme parks, tours, guides, car hire and many, many more discounted holiday promotions.
(Also check out the *Specials* link for national & international deals - 1-way or return).