Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
Coupon (439.99 USD): BGa27502
Coupon (469.99 USD): BGaf8354
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BG363880, CouponsdePC, BG79bd52, 2203ActiesNL, tRaDetRaCKeR, BG769c2d, BGed9ef4, pROMo8cuPoN, BGe63a33, Cuponation9, BG2387bf, BGa5d46f, BgGoodie9, BG26a19b
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Beelink GTI 11 i5-1135G7 Xe 16/500GB Mini PC is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).