You can get Astrolux C8 SST40 Flashlight for $19.98 using coupon code (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Weight: 151.8g (without battery), Model: C8, Max Output: 2200 Lumens, Emitter Type: SST40, Waterproof: IPX-8 waterproof 2meters, Impact Resistant 1.5M, Light Tint: 5000K (Neutral white), Circuit Driver: A17DD-L FET+1 Driver, 6500K (Cool white)
Banggood ($19.98)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. I think you want to know if the price is good. It looks like it’s a good price (lower than average ($20.03)).
Link: Banggood product page
Price: $19.98
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTORCH, BGUA6C8, BGC8A6, BGASTROLUX, BGAC8SST40, BGAST25, BGAFF10OFF, BGCuponation10, 4BLF, BG10OFFAFF, BGwhielabel, BGflashlight, BG10OFFAFF1, BANGGOODSD, BGTorch4, BGYW90, 00c906, BGtorch2, BGtorch3, BGAlerabat15, BGtorch7, BGOutlight10, BG589b2e, BG02d37c
(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
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 Astrolux C8 SST40 Flashlight.
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)).