Just check coupons out (with price alert and history). Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Wireless standard IEEE802.11b/g/n 2.4GHz WIFI, Support cat eye aperture 15 – 40mm, APP Name Mijia, Infrared night vision distance 5m, Support door thickness 35 – 110mm, Storage 4GB, Life time about 2 months (Calculated according to 30 routes per day), Power Supply Built-in 8400mAh lithium-ion battery, Human detection distance 3m, Lens 1 million pixels
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($159.99): BGLKBELL
2. ($178.49): BGBK15
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGXMCatY, Wholesale20, bgssaff9, wholesale20, BGaDmITAd, BGLUKEC10, BGAQ20, BGBAK15
(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 Xiaomi Mijia Luke CatY Video Doorbell? There we go.
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)).