Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
Coupon (27.65 USD): BGASTB
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): BG7UVC, BGUVC1, BGTORCH, BGASTROLUX, BGAST25, BGAFF10OFF, BGCuponation10, 4BLF, BG10OFFAFF, BGwhielabel, BGflashlight, BG10OFFAFF1, BGdeals126, BGdeals127, BGdeals172
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for Astrolux MF01 Mini-UVC 7x UVC+UVA Sterilizer Flashlight is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).