APP Mijia / Smart Life, Size 86*86*13mm, Output <16A(Electric) /AC100-240V, Power conss ≤1.7KWh/Month, Accuracy ±1℃, Model TH123, Color Silver, Temp range 5-35℃, Sensors NTC 10K B: 3950, Screen LCD, Input 220V AC±50/60HZ. Check coupons or create price alert down below. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGEU309, 6GSGIT, BG9b9f60, BG816295, BGd7d9d4, BGec0cd2, BG8f3212
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Heatcold TH123 Smart Thermostat Silver. The lowest price was: $36.49.
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)).