Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (39.55 USD): hoNEYbGdeAlS
Coupon (40.41 USD): BG00c906
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): BGHONEY2110, BGbd546a, 13f142, BG32e42d, BG2589f4, 00c906, ADMITAD2212, 2022ACTIESNL, Terence, BGa89ad8, Tabby20, BG5f79be, 2203ActiesNL, BG42e5b3, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Xiaomi Mijia MJSXJ02HL IP Camera 1080p Standard is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).