Body material Durable aircraft-grade aluminum, Angle of light beam 8° hot spot / 110° periphery, Reflector Glossy aluminum reflector 8 mm polycarbonate lens, Operation voltage 14 V to 9 V, Surface treatment Premium type III hard-anodizing, Weight 866g, Output levels High > low > strobe, Dimensions light head: 91 mm (length) * 60 mm (dia.) / canister: 265 mm (length) * 31 mm (dia.), Battery 3 * 26650 Li- ion battery (not included), Bulb 3 * White LED (color temperature: 6500 K), Waterproof Up to 100 Meters, Model DH30 II Canister Diving Light, Runtime High 200 min / low 450 min / strobe 500 min, Max brightness level 3600 lumens, Cable length 1.2 Meters, Color Black light with orange cable.
Basically copy coupon, view price history or create e-mail price alert. 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 price update (UTC time):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($456.52): BANGGOODSD
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG10OFFAFF, BGwhielabel, 4BLF, BG10OFFAFF1
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for ARCHON DH30 II L2 Diving Flashlight. The lowest price was: $382.5.
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)).