XML2 T6-3B 5000-5200K, Max. output 1000lumens, 1×18650 battery(not included).
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 price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($21.82): BGtorch2
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BRANDCV, e2bcea, linepayflt, EYBG, BGTORCH, M4Dconvoy1, 502C6B, BGBFCR41, BGCONV, BGCONVOYSS, BGFLS15, 4BLF, BGAFF10OFF, BGflashlight, BG10OFFAFF1, BANGGOODSD, BGTorch4, 00c906, BGtorch3, BGAlerabat15, BGtorch7
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – Convoy S2+ T6-4C Blue Flashlight ($-3)
2. China – Convoy S2+ U2-1A Blue Flashlight ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Convoy S2+ T6-3B Blue Flashlight. The lowest price was: $12.22.
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)).