Aliexpress
Click here… to search for DIGOO DG-PJ16R 433MHz Wireless Doorbell Kit [EU] on Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – DIGOO DG-PJ16R 433MHz Wireless Doorbell Kit (-3 USD)
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. This is new product in my database, so I don’t know if this price is good. One coupon is available. Cool!
Link: Banggood product page
Coupon (8.09 USD): BgcLuBofErtA10
(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): BGDigoo15%, BGDG15, BGSAMH, 20%DG422, BGDGDBG, BGDGPJ16R, BGSMOFF, BGDGASG, BGSAMRTH
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – DIGOO DG-PJ16R 433MHz Wireless Doorbell Kit (-3 USD)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: 8.09 USD.
You can set price alert (for Banggood).