Get $10 off your ride using code BLACKOUT using the Black & White Cabs App. Company appears to be Australia-wide.
You can see the ads running here.
The price in the app is just the normal cost of the fare which you can check on their site. Then $10 will be removed off your fare when you actually do your ride. You'll see the BLACKOUT code in the promo codes section of the app. It's not the most innovative app but you can select different cars like Maxi Taxi etc plus also fixed fare which may save money. Doesn't appear to be any minimum or any other conditions attached. I added my payment details to the app as I assume that's the only way the $10 comes off.