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AnkerDirect via Amazon has their PowerPort Speed 1 [amazon.com], a single port, 30W, USB-C wall charger with Power Delivery, on sale for $ 19.99 + FREE Shipping with orders over $ 25. That’s $ 8 off the regular price of $ 27.99.
This deal is valid NOW, and doesn’t require a coupon code. Also, at $ 20, it’s one of the cheapest chargers that supports Power Delivery you’ll find.