$17.90 – Tailstand: Yes, LED: SST40 6500K white tint, Mode memory: yes, Reverse polarity protection: Yes, Color temperature: 6500K, Low voltage warning: Yes, Reflector: orange peel, Battery included: no, Range: 50 – 100 meters, Whether to charge: no, Number of lamp beads: 1, Lens type: Ar-coated glass lens, Whether to remember the gear: yes, Light effect color: white light, Body color: titanium gray, Is it waterproof: level 8, Voltage: input voltage 3 – 4.2V, Lumens: 2300LM (maximum), Required battery type: 21700 or 18650 lithium-ion battery (not included), Required battery quantity: 1pcs.
Latest update shows that Convoy S21A SST40 Flashlight costs $17.9 (in Banggood). Check coupons or create price alert down below. You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood ($17.90)
Banggood warehouse is located in China. Is it expensive? Cool, average is $18.42, so current price is lower! There is one great coupon!
Link: Banggood product page
Price without coupon: $18.79
1. ($17.90): BG28c015
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGS21A, BG7S21A, EYBG, BGTORCH, 502C6B, BGBFCR41, fInbG2020, BGff2020, BGCONVOYSS, BGCONV, BGflashlight, BG10OFFAFF1, BANGGOODSD, BGTorch4, 00c906, BGtorch2, BGtorch3, BG8Alerabat, BGLED07, F03081, BG5de8a6, FIN1443, BGOutlight10, BG29ddce, BG6be74d, BGBLF26, BG589b2e, BGd57765, BGHOBBY240, Fin0308
(these codes were not working in latest coupon update, but you can check them 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
Here is price history (for all/most countries) for Convoy S21A SST40 Flashlight. The lowest price was: $16.99.
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)).