What's the best affordable pre-built mini server?

What's the best affordable pre-built mini server available in Europe? I'm looking for a reliable and compact option that won't break the bank

Edit: something that are not arm based

Edit 2: I'm looking to set up a system that can run Jellyfin, Ollama, and a few other small services. By 'pre-built', I mean I want to buy a device that already has the necessary hardware and installation, so all I need to do is install the operating system and I'm good to go