When I was updating this page, then coupon price was 423.19 USD for DT-9501 Radiation Scanner Geiger (in Banggood). Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood (423.19 USD)
Banggood warehouse is located in China. Is it a reasonable price for this item? Wow! That’s the lowest price in CouponsFromChina database! We have found one coupon for this product!
Link: Banggood product page
Price without coupon: 459.99 USD
Coupon (423.19 USD): BGHONEYSP
(CouponsFromChina.com tip: just apply this code in your 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): BGAUGUST8, BGTOOS729, BGCAPITALOS8, BGCOUPERT8, BG8FORMULAMX, BGBFDAY8, BGNEWYEAR8
(there’s a little possibility that old coupon will work)
Aliexpress
Click here… to search for CEM DT-9501 Radiation Scanner Geiger Counter on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for CEM DT-9501 Radiation Scanner Geiger Counter is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).