After using a coupon, the price is down to $13.69 (from Banggood). High Power Diving Flashlight IP68 Waterproof Professional Dive Lights 18650 Battery for Deep Sea Underwater Lighting Diving Torch.
Updated:
Banggood
Warehouse in China.
Link: Diving Flashlight IP68 XML-L2
Price: $13.69
Additional Banggood coupons:
1. First page
2. Second page
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for Diving Flashlight IP68 XML-L2? There we go. The lowest price was: $13.3.
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)).