Its about the same size a s Pi with one hell of a lot of power and run around $365 normally.
They come with windows, but you can load Linux if you like, we just let them windows and LTSB with a Remote Support Software installed and the SBC. Took all but 10 minutes to roll out.
I'm also looking for a Pi4 alternative as a temporary home for an SBC pending a full host server rebuild where a Debian VM will eventually be employed. There must be something out there that people have used that is competitively priced and up to the task. Only about 10 local SIP devices to handle.