Brand: Yeelight (Xiaomi Ecosystem Product), Rated power: 12W (300x 300mm), Color rendering index: Ra90, Lumens: 1800lm, 24W (300x 600mm), Download method: mobile application download, Brightness: stepless adjustment, APP: Mijia APP, Color temperature: 5700K, Model: YLMB05YL 300*300MM / YLMB06YL 300*600MM, Size: 300x 300x 63mm / 300x 600x 67mm.
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
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): AFfbG10, 7d18f7, aff7off, bgchinafest, BGYEE11COU, BGVDay10%off, BGLIGHT2020, BGAFF10OFF, bGhOnEy10, 99926f, BGYEE20COUPON, BgcLuBofErtA10, BG00c906, Terence, BGLED2203, 8Couponsde, MVC8SPRING, BGLED2206
(there’s a little possibility that old coupon will work)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – Xiaomi Yeelight YLMB06YL 300x600mm LED Ceiling Light ($-3)
2. Europe – Xiaomi Yeelight YLMB05YL 300x300mm LED Ceiling Light [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Yeelight YLMB05YL 300x300mm LED Ceiling Light. The lowest price was: $29.99.
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)).