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 (115.81 USD): tRaDetRaCKeR
Coupon (115.81 USD): 8wEbgaInS5
Coupon (117.07 USD): 2203ActiesNL
Coupon (118.33 USD): BG00c906
(CouponsFromChina.com tip: apply code in your basket (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): BGd0b05d, 00c906, ADMITAD2212, 2022ACTIESNL, 8BGwbg2204
(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 5 Inch Remote Swivel Wireless Baby Monitor 720P is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).