Communication method WIFI 2.4G, Weight 70g, Power supply mode DC 4.5V (3 AAA batteries), Working temperature -10~+55℃ 0~100%RH, Size 65x60x26mm/2.51×2.36×1.02in, Material ABS/PC.
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 price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($22.47): BGAlerabat1
2. ($24.85): BG00c906
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGTY071, BG10OFFAFF1, BGTYOC071, BANGGOODSD, 6GSGIT, BGPA071, 00c906
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Tuya Smart WiFi Temperature Humidity Sensor? There we go. The lowest price was: $16.99.
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)).