RAVPower has the a 2 Pack of their 20W USB-C PD QC 3.0 Wall Charger in white or black, model no. RP-PC150WSPF, for $9 (27 – 18 coupon) with Free Shipping for a limited time. To get the discount, use the coupon code: DNLP50 at checkout.
The RAVPower USB C Power Delivery Wall Charger packs 20W of power into a device the size of an Apple 5W charger but offers up to 3x faster. It supports 20W Power Delivery 3.0, QC3.0 and PPS.