You can create price alert here, copy coupons and view price history. What is best price?
Aperture F2.0, Brand IMILAB, Angle 105°, Power Input 5V=2A, Color White, Model ID CM5X138A, Dimension 108x76x76mm, Storage Cloud / Micro SD (Max 64GB) /(Micro SD Card Not Included), Color White, Voice Bi-direction, Linkage WiFi: 2.4GHz, Night Vision 4850nm infrared LED, Resolution 2560×1440, Smart Google / Amazon Alexa, Distance 40ft, Weight 249g
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I have no active coupons for you right now.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG62caed, BGca7052, BGSHOM15, BGcf3141, BG3f4d20, BG368a71, BG9351a5, BGIMXIN496, BGIMC21, BGISC111, BGDEC21, BGTYOD111, BGTYD111, BGZODU611, BGTYSE111, BGTYOB111, BGISOB111, BGHUOB111, BGTYON111, BGZUZU319, 6GSGIT, BGSPD111, BGDLZ111, BGISOJ111, BG4a7a54
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for IMILAB C21 4MP 2.5K IP Camera.
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)).