I got a HP Compaq Elite 8200 with a i5 and 8GB of RAM for 50 bucks on Newegg about a month ago. And shipping was free too.

I stuck in a spare ssd and 8TB drive. It is running Ubuntu.

Right now it acts as a pi hole, nextcloud server, Channels DVR server, Plex Media Server, and runs Transmission. It barely breaks a sweat.

I used to just have a Pi 3B+ doing duty as a pihole and nextcloud box.

This works better and overall cost less than the pi once I added in the sd card, case, fan, power supply.