Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (35.43 USD): BANGGOODSD
(CouponsFromChina.com tip: coupon code has to be applied in shop’s cart 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): TTxBG10, BG3CSUM, AFfbG10, 502C6B, 0e7f33, FBCOUPON1, BGXMI15, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for UMIDIGI Q1 15W Wireless Fast Charger is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).