Aliexpress
Click here… to search for Xiaomi Yeelight YLYD03YL Induction Night Light on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (17.27 USD): BGLED07
Coupon (17.85 USD): Cuponation9
Coupon (18.05 USD): TTSUMMER8
Coupon (18.44 USD): BG00c906
(CouponsFromChina.com tip: just apply this code 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): TTxBG10, AFfbG10, BGYLYD03YL, affbg10, BGaDmITAd, 502C6B, BGYEE11COU, 13f142, BG9NY, BGLIGHT2020, bGhOnEy10, bgshOOp10, BGLIGHT0920, BgoFErTaSchInA10, BGELIG0920, BGYEE20COUPON, BgcLuBofErtA10, BGYEE2021, BGYEEL10, BG10OFFAFF, BGwhielabel, BGLIG12, BG10OFFAFF1, BGYEELIGHT21, 00c906, Terence, BGLED2203, MVC8SPRING, 8BGwbg2204, 2203ActiesNL, tRaDetRaCKeR, pROMo8cuPoN, BGf94f14, BGLED2206
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi Yeelight YLYD03YL Induction Night Light? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).