When I was updating this page, then coupon price was 6.69 USD for 4-Port USB (in Banggood). Just check coupons out (with price alert and history). What is best price?
Latest price update (UTC time):
Banggood (6.69 USD)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? Price? It looks like it’s a good price (lower than average (6.99 USD)).
Link: Banggood product page
Price: 6.69 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG589b2e
(probably won’t work, but you can try them out)
Aliexpress
Click here… to search for 66W 4-Port USB PD Car Charger on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for 66W 4-Port USB PD Car Charger is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).