@BlackTiger,
You can find HERE the shop where you can find it.
Keep in mind this board is NOT as friendly as Raspberry Pi, at the moment you can install Lubuntu or Debian as operating system. I have been fighting with Debian to be able to Run the Local Server more than expected…(I’m NOT a Linux guy…)
If you are newbie using Linux I would rather use the Pi Zero instead adding a Wi-Fi dongle. I did a tutorial for the Pi Zero to install the Server. You can find it HERE