You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
NFC device capacity 25, Model Aqara P100, not included)/4xAA battery(6V, Password capacity 50 groups permanent password/25 groups Periodic password/8 groups Disposable password, Color Black, Fingerpringt capacity 50, Wireless connection bluetooth 5.0/Zigbee3.0/WiFi 2.4G, Working humidity 0~93% RH, Suitable for 0-80mm thickness door, not included)/Type-C emergency, Power Supply 6000mAh lithium ion battery(3.8V, Weight Approx 4.6kg, Working temperature -10℃~ + 55℃, Emergency Power Supply Interface Type C, Material Aluminium alloy, Size 400.6×78.6×28.7mm
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 code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($437.39): BGAFF10OFF
2. ($476.99): 7bcdf9
just apply this code in your 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): BGKN89, bGhOnEy10, BGHWDEALS, BgoFErTaSchInA10, BgcLuBofErtA10
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Aqara P100 Smart Camera Door Lock.
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)).