Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Shape Round, Weight 20g, Color Temperature 2700K, Working Temperature -10 – 40°C, stairs, Size 70x 70x 35mm / 2.76″x 2.76″x 1.38″, Working Humidity 0% – 85%RH, Rated Power 0.4W, Switch Modes Smart light, Lighting Range 20cm or more without obstruction, Input Voltage AC 220V, hallway, Material ABS + Metal, Color White, Model YLYD10YL Plug-in LED Smart Night Light, Manual off, Light Color Warm Light, baby room, Connector Type CN Plug, Aoolication Bedroom
Aliexpress
There’re some similar (or not) items 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.
Link: Banggood product page
1. ($7.41): BGYEE20COUPON
2. ($7.41): BgcLuBofErtA10
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 and https://couponsfromchina.com/short/5cd
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
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Xiaomi YEELIGHT YLYD10YL LED Night Light CN Plug is here.
Price records source(s): Gearbest, 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)).