Dimensions: 89*70*118mm, Output: 50W Max, Input: 5V⎓4A 9V⎓2A 10V⎓6.5A 20V⎓3.25A Max, Weight: about 180g, Material: PC.
Price history, coupons and price alert are available on this page. Best price?
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it?
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGOnePlus50W, BGHONEY2110, BGc69d48, BGa0f578, 13f142, BGa3aaa2, BG27de80, BGHU1060, BANGGOODSD, BGCCARG, BG85d5c6, Tabby20, 2203ActiesNL, BG1d0af2, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for OnePlus 50W Warp Charge Wireless Charger. The lowest price was: $59.99.
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)).