4x Nichia 219C, 1x 18650 or 18350 Battery (Not included), Nichia 219C: 5000K, 184 Meters, 8500 CD, 2100 Lumens.
Check coupons or create price alert down below. 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. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($38.00): 00c906
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGS43S, BGLF1, XMASBG, AS43S, CFCBG, cmb1, AC18, BG7S43S, BGSM30%, ac18, FLGEU, M4BG, BGBFCR40, 2019FG, AXMAS, BGSPR, m4x2020, BGASTROLUX, BGTBD, BGAST25, cbrIDgTec, BGflashlight, BG10OFFAFF1, BANGGOODSD, BGTorch4
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Astrolux S43S Copper XP-G3 Flashlight ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Astrolux S43S Copper Nichia 219C Flashlight. The lowest price was: $18.2.
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)).