You can create price alert here, copy coupons and view price history. What is the best price?
Battery: 2x AAA battery(not included), Measurement Accuracy: 0.1, Alarm Mode: buzzing alarm, Color: white, Model: B37919, Measuring Object: HCHO/TVOC/AQI, Name: Formaldehyde Tester
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I don’t want to misguide you about the price. I don’t know if it’s good, because I don’t have enough records in my database… Well, there is one coupon available right now.
Link: Banggood product page
1. ($16.19): BGGines
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $16.19.
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)).