Aliexpress
Click here… to search for Sofirn SF32UV Nichia 365UV UV Flashlight on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (16.03 USD): fInbG2020
Coupon (16.62 USD): BGff2020
Coupon (17.20 USD): BGTORCH
Coupon (17.20 USD): BGSF
(CouponsFromChina.com tip: put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 502C6B, e2bcea, linepayflt, EYBG, BGBSPX, BGBFCR41
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for Sofirn SF32UV Nichia 365UV UV Flashlight.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).