You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Resolution Ratio 4K, Sensor Technology CMOS, Charging Voltage DC-5V/1A, APP Support Android/iOS, Storage Type Removable (Card/Disc/Tape), Memory Card Type MicroSD/TF, High Definition Support 4K, Storage Micro SD card / Max support 128GB, Recording Definition Ultra High Definition, Battery type Built-in rechargeable polymer lithium battery, Video Format ASF, Player Software VLC Player/SMPlayer, Size 44x24x44mm/1.73×0.94×1.73in, Material ABS, Built-in Memory Size Non
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. There is one great coupon!
Link: Banggood product page
1. ($6.99): BGe1f246
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): BGxip564, 13f142, BGTYOC564, BGISOC564, BGTYC564, BGISC564, BGISOD564, BGSP564, BGISSP564, BGSPHOME62, BGTYSY564, BANGGOODSD, BGPOS564, BGUdb25, BG00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 8Couponsde, MVC8SPRING, 8BGwbg2204, 2203ActiesNL, tRaDetRaCKeR, 8wEbgaInS5, BGJUNEGSG9, Cuponation9, BGca595e, BG589b2e
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for A9 4K Wifi Mini Hidden 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)).