Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (32.70 USD): 2022ACTIESNL
(CouponsFromChina.com tip: apply code in your basket (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): 3632e5, BgcLuBofErtA10, 33a33c, BGAFF10OFF, BGCuponation10, BG10OFFAFF, BGDIFEISI10OFF, BGLIG12, BG10OFFAFF1, BGd0b05d, ADMITAD2212
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for Difeisi DFS-EC-0001 E27 9W WIFI A60 RGB+CCT Smart Bulb is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).