Aliexpress
Click here… to search for Baseus 10W Visible Qi Wireless Charger Black on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (23.55 USD): BGCCARG
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 502C6B, TTxBG10, BG3CSUM, bgssaff9, AFfbG10, BGBFAFF2019, BGCITYADS2019, bGpAnDacHeCk, BGVDay10%off, BGAFF10OFF, bGhOnEy10, BGXMI15, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10, 13f142, BGBAseus51, BgcLuBofErtA10, BG20CHARGER, BGMBCBLE, BGCuponation10, BGHONEY2110, BANGGOODSD
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Baseus 10W Visible Qi Wireless Charger Black is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).