Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – DIGOO DG-DB1 433MHz Wireless Doorbell (-3 USD)
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. There’s only 1 record in my database, so I have no idea if the price is OK.
Link: Banggood product page
Coupon (4.99 USD): BG8d771c
Coupon (6.99 USD): BG2ef758
(CouponsFromChina.com tip: apply code in your basket (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): BGSMOFF, BGDGASG, BGSAMRTH, BGDB109, BgcLuBofErtA10, BG15SH12, BGAFF10OFF, BGSTHO15, BG9b699e
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – DIGOO DG-DB1 433MHz Wireless Doorbell (-3 USD)
Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was 4.99 USD).
You can set price alert (for Banggood).