Just check coupons out (with price alert and history). You probably want to know what is the best price?
Lens Tempered optical glass, Mode First gear (constant light), Battery life 40 minutes, Shell material Aviation aluminum T6061, Weight 12.3g, Battery 1xAAA battery (not included), Input voltage 0.8-2V, Size 7×1.5cm (lengthx head), LED power 1W, Waterproof IPX8, Reflective material Aluminum alloy reflector cup, Anti-drop height 1.5m, LED wavelength 365nm
Aliexpress
There’re some similar (or not) items on Aliexpress
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. Well, there is one coupon available right now.
Link: Banggood product page
1. ($16.68): BGAlerabat15
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTKUV01, M6434, FIN1734, bgshOOp10, bGhOnEy10, BgoFErTaSchInA10, BgcLuBofErtA10, BGFLS15, 4BLF, BGAFF10OFF, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGflashlight, BG10OFFAFF1, BANGGOODSD, BGTorch4, BGtorch3
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for TANK007 UV01 365nm Flashlight? There we go.
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)).