Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (1672.28 USD): BG717000
(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): BG7a2816, BGVGAMES, DealBGimpact, Cuponation9, BGJP42f3, BGVDGA07
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for ONE-NETBOOK OnexPlayer Mini 5800U 7 inch 16GB 2TB Game Console.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).