[lozaning]

Thinkpad X230 can be picked up for around $100. I use one as my daily driver, another $70 or so picks you up an SSD and a 16GB ram kit.

[CydeWeys]

Think that'd make a better server than a Raspberry Pi 4 for the price? It's nice that it includes a built-in battery backup, plus screen/mouse/keyboard for initial setup and later debugging. On the down side, it takes up more space.