What is the cheapest way to host my own server?

I'm wanting to run my own SimpleX chat server and set up a Monero node as well.

Can this be done on the same machine? I was considering getting a mini PC to do this so it wouldn't be too much of an issue with it being always on.

Or should I take a different approach and set up both separately on two different machines like a raspberry pi or something?

As I'm sure you can tell I don't have a lot of experience with self hosting anything but want to get into it to help strengthen the networks of these communities I care about.