You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
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
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):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($159.99): BGLKBELL
2. ($178.49): BGBK15
put item in your cart and apply coupon code there 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
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Mijia Luke CatY Video Doorbell.
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)).