Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. There is one great coupon!
Link: Banggood product page
Coupon (500.49 USD): BGJUNEGSG9
(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): 2203ActiesNL, MVC8SPRING, 8BGwbg2204, BG8a36f8, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGea6100
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for CHUWI FreeBook 13.5 inch Laptop N5100 12/512GB Touch.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).