$25 off your next Uber ride, by making the booking/request through Google Maps. According to members on OzBargain, this should work for existing users. Make sure you update your Google Maps app to the latest version, as this feature was only rolled out recently.
You will also need to link your Google account to your Uber account.
Thanks to muto over at OzBargain for spotting the Aussie offer ($20 off), which prompted me to enter in a route in New Zealand (and for other countries) to see if there were similar offers, and surprisingly there were. You can also utilise this in the US ($15 off), UK (20 GBP off), SG ($10 off), ID (IDR 75,000 off) etc.
A bunch of members on OzBargain have reported not seeing the offer, so I've marked it as 'Targeted' for now.