Price history, coupons and price alert are available on this page. What is 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 and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($437.39): BGAFF10OFF
2. ($476.99): 7bcdf9
you should apply the coupon 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
(you can check these old coupons out, but these probably won’t work)
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)).