Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon 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): BG06c699, BGb3dd5b, 6GSGIT, 00c906, BG7a10c8, BG11feac, BGef96eb, BGee0795, BGa51978, Kortings10, 2022ACTIESNL, BG386df1, BG7128bb
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for Minisforum EliteMini TL50 i5-1135G7 12/512GB Mini PC is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).