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.
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Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($6.99): BGe1f246
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
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
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for A9 4K Wifi Mini Hidden Camera. The lowest price was: $6.99.
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)).