Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
Coupon (331.82 USD): BGYEELIGHT21
(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, BGaDmITAd, Wholesale20, BGYEE11COU, BGVDay10%off, BGLIGHT2020, bGhOnEy10, bgshOOp10, BGYEE20COUPON, BgoFErTaSchInA10, BGHALLOWEEN, BgcLuBofErtA10, BGYEE2021, BGCuponation10, BGYEEL10, BGHONEY2110, BG10OFFAFF, BGwhielabel, 7bcdf9, BGLIG12, BG10OFFAFF1
(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 YLYB02YL Bath Heater Pro Ceiling Light is here.
Price records source(s): Banggood
Click on image to enlarge.
You can set price alert (for Banggood).