Just check coupons out (with price alert and history). Let’s see what best price is ATM.
BT bluetooth 4.0, Software OS Windows10, Graphics Intel® Iris® Graphics 6100, Wireless LAN 2.4G/5G WiFi, 802.11 b/g/n/ac (Intel 3165), CPU Intel® Broadwell Processor i5-5257U Dual Core 2.7GHz (2C/4T 3M Cache), Storage M.2 SSD 256GB, DDR3L 8GB
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 and price update (UTC):
Banggood
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now…
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGY8263, BGY23956, BGY2987, 7bcdf9, BGYBL57, BGYBU57, BGHALLOWEEN, BGBLMINI, BGBEELU57, BGBELU57A, BGsantaUK10, BGU57PC, BGBLU5503, BGBLU5504, BGe68290
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Beelink U57 i5-5257U 8/256GB Mini PC [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for Beelink U57 i5-5257U 8/256GB 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)).