Aliexpress
Click here… to search for DIGOO DG-XYB 720P Video Doorbell on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
Coupon (19.97 USD): BGSMOFF
(CouponsFromChina.com tip: this code has to be applied in your 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): BGUKXTRA2, BGUK7, 2019SPEDM, bgssaff9, BGDGXYB, aff7off, BGDigoo15%, BGA1XYB, BGaDmITAd
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for DIGOO DG-XYB 720P Video Doorbell? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).