Just check coupons out (with price alert and history). You probably want to know what is the best price?
up to 2.2 GHz), Intel CPU Intel Celeron J3455 Processor (2M Cache, WIFI IEEE 802.11a/b/g/n 2.4G+5.8G, Ethernet 1000Mbps LAN, Antenna Built-in antenna for WIFI, Installed RAM DDR3 6GB, Bluetooth BT 4.0, Burst Frequency 2.20 GHz, Cache 2 MB, Instruction Set 64-bit, Language Multi -language, OS Support Windows10, System Disk Windows(C: ) 64GB EMMC, Expand Memory SD Card (Support 128GB), Processor Base Frequency 110 GHz, Scenario Design Power (SDP) 2 W, Processor Graphics Intel HD Graphics
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
1. ($227.24): Wholesale20
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGBFCR29, BGCITYADS2019
(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
Here is price history (for all/most countries) for CAK3V J3455 6/64GB 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)).