Power Source: Battery powered, Item Weight: 1.14 pounds, Brand: MECO, Product Dimensions: 4.9*2.2*1.2 inches, , ASIN: B07W8SGKBB, Item Dimensions(L*W*H): 4.9*2.2*1.2 inches, Batteries: 2 Lithium ion batteries required. (included), Color: Grey, Manufacturer: MECO.
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Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($49.99): BGc9c376
2. ($62.68): BGGutscheine
3. ($63.37): BG8ReviTrage
4. ($63.37): BGcoupon8off
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): Cuponation9, COUPONSDE1wk
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for MECO ELE Video Doorbell 1080P. The lowest price was: $49.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).