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I bought one of these at the last sale. It worked once but died. Given the price I thought I'd give it another crack since I was given a refund. What I really liked is how compact this unit is. It fits under the cover flap and has fast charge.
https://www.geekbuying.com/item/Tronsmart-C24-Dual-USB-Ports…
Bundle also available with 2x sub type c cable for $7.02 USD ($9.18 AUD)
Bundle Tronsmart 2 Packs 1m/3.3ft USB A/F 2.0 to Type-C/M 2.0 Charging & Sync Cable + Tronsmart C24 Dual USB Ports Smart Car Charger
https://www.geekbuying.com/item/Tronsmart-2-Packs-USB-A-F-2-…
Dual-Port VoltiQ
VoltiQ automatically adjusts amperage and wattage to the maximum ratio required by your devices so that more current-hungry devices are not starved and less current-hungry devices are not over-allocating resources. In short, VoltiQ automatically detects your device, adjusts wattage and amperage, and then delivers the maximum charging speed.
Dual Onboard Integrated Circuits
Each port functions independtly.
Safe Charging
All our power products are rigorously tested and come with our Omni-Protect system ensuring safe charging for all your devices.
Compact Design
Easily fits inside your car cigarette lighter and is compatible with almost all vehicles worldwide.
Universal Compatibility
Charge all USB powered devices from iPhones, iPad to Android phones, tablets, and Bluetooth headphones & speakers, smartwatches & more.
It took GeekBuying 2 weeks to even ship my order ( https://www.ozbargain.com.au/node/335325 ) and it's not arrived yet, if you plan to buy stuff from them you may not get it before Christmas.