I have checked all old coupons and price is $36.99 for Tuya Smart WiFi Weather Station (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Latest coupon and price update (UTC):
Tuya Smart WiFi Weather Station EU Plug Indoor Outdoor Thermometer Hygrometer with Color Display Screen APP Remote Control Alarm Clock Setting Humidity Temperature Sensor Device
Banggood ($36.99)
Banggood warehouse is located in China. The question is – is it a good price? Pretty sweet, this is the lowest price I have ever noted for this product! I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Price without coupon: $41.99
1. ($36.99): BGRSEPTTSWF
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG8FORMULAMX
(you can check these old coupons out, but these 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 Tuya Smart WiFi Weather Station? There we go.
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)).