Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (169.99 USD): BGCWG10
Coupon (219.99 USD): Wholesale20
Coupon (219.99 USD): wholesale20
Coupon (223.19 USD): PICODICOM
(CouponsFromChina.com tip: you should apply the coupon 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): 502C6B, BGCWGB, BGCWGB01, BGCWGB08, BGBFAFF2019, BGCITYADS2019, BGCWGB09
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for CHUWI GBox 4/64GB Mini PC? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).