$21.99 – Electromagnetic Radiation Tester Field EMF Gauss Meter Ghost Hunting (Banggood, Aliexpress: Portable Electromagnetic Radiation Tester Field EMF Gauss Meter Ghost Hunting Tester with 5 LEDs – Blue (the best price with coupon)).
I have just checked coupons. The lowest price I could get is $21.99 for Electromagnetic Radiation Tester Field EMF Gauss Meter Ghost Hunting (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood ($21.99)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Is it expensive? Well, this price is higher than average price ($20.99)
Link: Banggood product page
Price: $21.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
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
Price history (for all/most countries) for Electromagnetic Radiation Tester Field EMF Gauss Meter Ghost Hunting is here. The lowest price was: $19.99.
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)).