Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (15.36 USD): 20%DG422
(CouponsFromChina.com tip: coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 16EX03, BG15EX03, affiliate6, BG13EX03, BGDGPL, aff7off, BGEX039, BGEX003, BGDigoo15%, BGDGEX3
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for DIGOO DG-EX003 Weather Station.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).
None of six provided coupons are working 🙁
“This coupon is not available for limited offer products.”
That’s true. Create price alert please – it may be active again