$20.37 – tail press, Color temperature: 6500K, Light cup: smooth cup, Material: aluminum alloy, Lumens: 2000lm, Lamp beads: SST40, Voltage: input voltage 3 – 4.2V, Can remember the gear position, Power supply: 1x 18650 battery (without battery), Range: 300 – 500 meters, Power: 15W, Battery life: about 1 hour (depending on battery capacity), Switch type and position: reverse switch, Waterproof rating: IPX8.
I have checked all old coupons and price is $20.37 for Convoy C8+ SST40 Flashlight (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
Banggood ($20.37)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Low/high price? According to my database, the average price is $21.41 and current price is $20.37, so it’s probably a good price!
Link: Banggood product page
Price: $20.37
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGC840, linepayflt, EYBG, BGSM30%, BGF1111, fInbG2020, BGff2020, BGSPR, BG14TH16, BG1128, BG10OFFAFF, BG10OFFAFF1, BGYW67, BANGGOODSD, BGTorch4, 00c906, BGtorch2, BGtorch3, BGdeals269, BGAlerabat15, BGtorch7, BGAlerabatI, BG4cc4ac, BGtorch9, BG8Alerabat, BG59c74f, BGLED07, BGOutlight10, BGec231b, BG12a755, BGfe53d3, BGb49332, BG6dd5c5, BG1393ae, BG970e54, BGe8ed4f, FIN9802, BG770b1d, BGBLF31, BG589b2e, BGd57765, BGHOBBY241A, BGC8T40
(system checks these coupons on every price check (like once per 24 hours), 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
Price history (for all/most countries) for Convoy C8+ SST40 Flashlight is here. The lowest price was: $16.5.
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)).