Aliexpress
Click here… to search for Xiaomi YEELIGHT YLYD10YL LED Night Light CN Plug on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (7.41 USD): BGYEE20COUPON
Coupon (7.41 USD): BgcLuBofErtA10
(CouponsFromChina.com tip: this code has to be applied in your 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): AFfbG10, BGYL555, BGYLYD10YL, BGYEE459, BGYLP45, BGYLNL88, bgchinafest, BGYEE11COU, BGYEE444, BGBFCR02, BGBFCR01, bGpAnDacHeCk, 2020CNY, BGLIGHT2020, BGYEBWCN, BGAFF10OFF, BGdragonBoat, BGLIGHT0920, BgoFErTaSchInA10, BGELIG0920
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi YEELIGHT YLYD10YL LED Night Light CN Plug? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).