$81.08 – Output current 17.8A (SFT40)/16A(SST40), Illumination Maximum 265KCD(SFT40)/142.5KCD(SST40), Range Maximum 1029m(SFT40)/755m(SST40), Lens Type Ar-coated glass lens, Low voltage warning Automatic power off, Battery tube diameter 51.8mm, Packing size 183 * 98.5 * 78.9mm, Head diameter 69mm, Brand CONVOY, Luminous flux Maximum 6800LM(SST40)/5400LM(SFT40), Flashlight length 158.4mm, Tail stand Yes, Product weight 569g, Battery type required 3*21700 batteries (unprotected), Tc 6500K/5000K, Weight with box 706g, Reverse polarity protection None /The positive side of the battery should be facing the head, Material Aluminum alloy, Switch position Side button in the head, Reflector Smooth, Mode memory Yes, Battery included or not Not included, Product name Flashlight, Charging TYPE-C charging interface (charging current 3A).
You can get CONVOY 3X21A SFT40 SST40 Flashlight for $81.08 using coupon code (in Banggood). You can create price alert here, copy coupons and view price history. Best price?
Latest price update (UTC time):
Banggood ($81.08)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Price? Hmmm, price is higher than average (which is $67.39 right now), so better set price alert down below…
Link: Banggood product page
Price: $81.08
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGflashlight, BGCONV, BG10OFFAFF1, BANGGOODSD, BGTorch4, 00c906, BGtorch2, BGtorch3, BGAlerabat15, BGtorch7, FIN6582, BG8Alerabat, BGOutlight10, BG589b2e, BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BGd57765, BGSPRING8OFF, BGHONEYSP, BGCMP351
(I don’t think these’re gonna work, but you can try ’em out anyway)
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.
Price history and price alert
Check out price history chart (for all/most countries) for CONVOY 3X21A SFT40 SST40 Flashlight. The lowest price was: $54.97.
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)).