Cree XM-L2 U3, 1100 lm, 20660cd, 6500K, Waterproof Standard: IPX-8 Standard Waterproof, Battery Quantity: 1x 3400mAh USB rechargeable 18650 battery (included).
Basically copy coupon, view price history or create e-mail price alert. Best price?
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. One coupon is available. Cool!
Link: Banggood product page
1. ($88.96): 4BLF
paste coupon code in your cart and click Apply 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): BGPOU, 502C6B, linepayflt, EYBG, BGTORCH, BGBFCR41, bGhOnEy10, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGCLUBOFERTA10, BGFLS15, BGAFF10OFF, BGCuponation10
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for MecArmy SPX18 Flashlight is here. The lowest price was: $56.99.
Price records source(s): Gearbest, 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)).