$40.99 – HFS-20 Geiger Counter Nuclear Radiation Detector (Banggood, Aliexpress: HFS-20 Geiger Counter Nuclear Radiation Detector Personal Dosimeter X-ray Beta Gamma Detector LCD Radioactive Tester Monitor (the best price with coupon)).
ATM you can buy HFS-20 Geiger Counter Nuclear Radiation Detector for $40.99 (in Banggood). You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Latest coupon and price update (UTC):
Banggood ($40.99)
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update. Is it a low price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $40.50)
Link: Banggood product page
Price: $40.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): BGTOOS729
(these coupons are old, so probably won’t work)
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
Do you need price history chart (for all/most countries) for HFS-20 Geiger Counter Nuclear Radiation Detector? There we go. The lowest price was: $39.99.
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)).