Working voltagr 3V~4.2V, Dimension 160(Length)*46(Tail dia)*25.5(Head dia), Waterproof IPX7, Range 350m, Accessories Diving lanyard, Net weight 175g, Beam angle 8 degree, lubricating oil, Battery 1x 18650 li-ion battery (not included), O ring.
Price history, coupons and price alert are available on this page. 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 coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($14.00): BGtorch3
2. ($14.82): BGtorch2
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): BGTORCH, bGhOnEy10, FINND22, bgshOOp10, BGFLS15, BGAFF10OFF, BGCuponation10, 4BLF, BG10OFFAFF, BGwhielabel, BGflashlight, BG10OFFAFF1, BANGGOODSD, 6GSGIT, BGTorch4, 00c906
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for SEEKNITE ND22 SST40 Flashlight? There we go. The lowest price was: $14.
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)).