Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. I don’t think there is an active coupon right now – at least in my database.
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): BGb69241, BG51e749, BGef96eb, BG745624, BG2c6a35, 2022ACTIESNL, BG67aa44, BGd1b1cb, Terence, BG71bae2, 2203ActiesNL, CouponsdePC, BGb26d41, BG284eb3, BG012f5f, BG455b5f, BG54b350, Cuponation9, BGTKMN15OFF, BGTKMN20OFF, BGc1bba4, BG5f66ee, BgGoodie9, BG8ReviTrage, BG0f37d6
(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 TRIGKEY Speed S Mini PC i5-8279U 16/512GB? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).