Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG351V28, BGCuponation10, BGHONEY2110, BGJOEAK, 7bcdf9, BGJOE7J, BGJPYS7J, BGJP351C, BGJPN3RG, BGNRGEEK351V, BGAlerabat5
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for ANBERNIC RG351V 144GB Game Console is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).