Aliexpress
Click here… to search for Xiaomi Yeelight YLSD04YL Spotlight on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (25.95 USD): BGYEE2021
(CouponsFromChina.com tip: apply it 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): 502C6B, TTxBG10, aff7off, AFfbG10, BGaDmITAd, BGYLSD04YL, BGYEE11COU, 0e7f33, BGLIGHT2020, FBCOUPON1, BGCuponation10, BGYEEL10
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for Xiaomi Yeelight YLSD04YL Spotlight is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).