Xiaomi Yeelight 90W LED Ceiling Light (Banggood, Aliexpress: Type: Starry lampshade / White lampshade, Applicable: 25-35 square meters, Product size: 960x 640x 96mm, Brand: Yeelight (Xiaomi ecological chain), Color rendering index: RA95, Rated power: 90W (the best price with coupon)).
Just check coupons out (with price alert and history). Let’s see what best price is ATM.
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. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($405.02): BGYEE20COUPON
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, BGaDmITAd, BGYEE11COU, bGpAnDacHeCk, BGVDay10%off, BGLIGHT2020, bGhOnEy10, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Yeelight 90W LED Ceiling Light. The lowest price was: $289.99.
Price records source(s): 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)).