For anyone looking for a good value prepaid plan, thanks to theomelette you can now get Kogan gift cards for 15% off, then use them to buy Kogan Mobile's $315 23GB/mth plan.
Due to the $50 and $100 denominations of Kogan's gift cards, I personally bought $300 worth of gift cards for $255 and paid a full $15, hence the $270 price tag. If you usually buy stuff from Kogan, you will be paying $267, which works out to be $22.00/mth.
16GB, 6GB and 4GB plans also available at an additional 15% off:
https://www.kogan.com/au/shop/phones/?q=prepaid%20plans
Don't forget cashrewards! Happy hunting.
If these guys threw in some international minutes as well, they would be unmatched!