Type-C port 5V-20V=6A MAX, Output Power: 50W MAX, Input Port: Charging cable DC port 12V / 24V 6A Max, Brand: Huawei, Demensions: 118 mmx 73.5 mmx 40.5 mm, Model Name: HUAWEI SuperCharge Wireless Car Charger (Max 50W).
Basically copy coupon, view price history or create e-mail price alert. Best price?
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($67.99): BG34b4f9
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG85d5c6, BGAlerabat, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG8OFFCOUPON, TTBLACK5
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Check out price history chart (for all/most countries) for Huawei 50W SuperCharge Wireless Car Charger. The lowest price was: $67.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).