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If you have a phone with a Qualcomm Quick Charge-compatible Snapdragon chipset, here's the cheapest deal for a QC 3.0 wall charger. This charger is also backwards compatible with all previous Quick Charge standards.
Even if you don't have a Quick Charge-compatible phone, this quality wall charger can be used as a normal USB charger for your other USB-powered devices.
Note US Plug only, so you'll need an US-to-AU plug adapter.
That brand is awesome by the way. I have several of their products and they're all really good.