Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (404.79 USD): pROMo8cuPoN
(CouponsFromChina.com tip: this code has to be applied in your 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): BGCEEU512, BG156PAU, BGCE156E, BGdff37e, BGc78df7, 2022ACTIESNL, BG40841c, Terence, BG2ffb7f, Tabby20, 2203ActiesNL, BG68a3a8, BG1efeb0, BG752274, MVC8SPRING, BGc84937, 8BGwbg2204, BG5e14a0, tRaDetRaCKeR, BGfa9514, BGa7c37c, BGdd7f3a, BGaae3a6
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for CENAVA PA156 15.6 inch J4125 12/512GB Notebook.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).