Check coupons or create price alert down below. Let’s see what best price is ATM.
Power supply: 2x 18650 battery (not included), Wattage: 3W, Color Temperature or Wavelength: 6500k
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Price history and price alert
Here is price history (for all/most countries) for COB Portable Patch Floodlight.
Price records source(s): Gearbest
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)).