I have just checked coupons. The lowest price I could get is $16.99 for BALDR Wireless Weather Station (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
BALDR Wireless Weather Station Alarm Clock Touch Screen In/Outdoor Thermometer Hygrometer Forecast Calendar Comfort Indicator Wireless Remote Sensor – White
Latest coupon and price update (UTC):
Banggood ($16.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. I think you want to know if the price is good. Awesome! This price is the best in CouponsFromChina database!
Link: Banggood product page
Price: $16.99
This is the best price ever noted in my database!
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
Check out price history chart (for all/most countries) for BALDR Wireless Weather Station.
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)).