Aliexpress
Click here… to search for Xiaomi Linptech Wireless Doorbell Normal on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now…
Link: Banggood product page
Price: -3 USD
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!
Old coupons (from the oldest to the newest): BGHU230, BGDS01, BGdb10, BG6648, TTxBG10, BG2646, BGbell, BG3088, BGlinptech, BG2756, BGCITYADS2019, BG5258, 13f142, BG5784, BG4860, BG4986, BG7668, BG7960, bGhOnEy10, BG8883, BGHWDEALS, BGCuponation10, BGHONEY2110, BANGGOODSD, 6GSGIT
(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 Linptech Wireless Doorbell Normal.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).