Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
Coupon (367.99 USD): tRaDetRaCKeR
Coupon (367.99 USD): 8wEbgaInS5
Coupon (367.99 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): BG53cc4f, BG1e0cb3, BG1efeb0, MVC8SPRING, 8BGwbg2204
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for CHUWI MiniBook Yoga J4125 6/128G 8 Inch Windows 10 Tablet.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).