And actually this one seems pretty affordable:
https://www.amazon.com/dp/B0196JB1ZS/ref=psdc_12557637011_t1_B01D8C6ULO
I was excited to find an alternative to the $49 Apple charger, but the USB-C port on this seems to support 5V x 3A max, not 14.5V x 2A needed for fast charging iPad Pro unfortunately.
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