Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong. There are no coupons available at this moment 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): 7bcdf9, BGef96eb, BG1e5c3e, 2022ACTIESNL, BG00c906, CouponsdePC, BGc4817c, BGd4b33a, 2203ActiesNL, tRaDetRaCKeR, BG8cf163, BG7ae4b5, BG0a24f8, BG886634, BG790ab8, BGJUNEGSG9, Cuponation9, BGc52531, BGd459c9, BG0cf6f6, BgGoodie9, BG17f26b, BG315255, BG589b2e
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for Beelink GK55 J4125 8/128GB Mini PC? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).