Wireless LAN 802.11 b/g/n/ac Bluetooth 4.0 (Intel 3165), Graphics Intel® UHD Graphics 600, CPU Intel® Gemini Lake Refresh Processor J4125 (4C/4T / 4M Cache / 2.0GHz up to 2.7GHz), DDR 8G, Storage SSD 128G.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Updated:
Banggood
Warehouse in Hong Kong.
Link: Beelink GK55 J4125 8/128GB Mini PC
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!
Additional Banggood coupons:
1. First page
2. Second page
Price history and price alert
Do you need price history chart (for all/most countries) for Beelink GK55 J4125 8/128GB Mini PC? There we go. The lowest price was: $129.99.
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)).