Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (6.99 USD): BGe1f246
(CouponsFromChina.com tip: coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
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
Price history (for all/most countries) for A9 4K Wifi Mini Hidden Camera is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).