Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (198.99 USD): BG48eb01
Coupon (253.88 USD): Cuponation9
Coupon (256.67 USD): BG8ReviTrage
(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): BG61ecce, BGVDGC12, BGc7719e, BGAlerabat5, BGAlerabat1, BGd179a1, tRaDetRaCKeR, 8wEbgaInS5, BG755b16
(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 ANBERNIC RG552 RK3399 4/64GB Game Console? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).