Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
Wireless WIFI 6E (802.11ax), Brand Beelink, RAM 16GB DDR4 / 3200MHz / support up to 64GB, Bluetooth BT 5.0, GPU AMD Radeon Graphics, Operating System Windows 11, Power Supply Charge Adapter, Type SER4, Core Octa-Core Sixteen Threads 4MB Cache /1.8GHz / Up to 4.4GHz, SSD Support 2.5 inch HDD(7mm), CPU AMD Ryzen 7 4800U, Hard Drives Capacity 500GB M.2 NVMe SSD / support up to 2TB, Ethernet Network Support RJ45 1000M*1
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. Coupons for Beelink SER4 Ryzen 7 4800U 16/500 Mini PC? Nope, there’re no coupons in Banggood.
Link: Banggood product page
Price: $-3
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG389b09, Terence, Tabby20, 2203ActiesNL, BG62d4c6, CouponsdePC, BGd508b9, tRaDetRaCKeR, BG4c9cf7, 8wEbgaInS5, BG76cedd, hoNEYbGdeAlS, BG96e3f6, Cuponation9, 9OFFSUMMER, BG29b766, BGbce9d2, BgGoodie9
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Beelink SER4 Ryzen 7 4800U 16/500 Mini PC.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).