Here's a little turnkey mill on Amazon for $125

https://www.amazon.com/dp/B08HRKLS6R/?ref=idea_lv_dp_

It's only about one step above mounting a spindle on your 3d printer but it's a cheap place to start learning.

I've built 2 of them this year and they will do aluminum, barely. The design has some flaws as well, easily fixed with 3d printed pla alignment plates.

Real machinists will tell you these are a joke, and they are, but the punchline is that they are adequate for a lot of folks.

In six months you'll have replaced 90% of the parts in the course of upgrading it to your specific needs, but you can do that gradually as you learn what you need and how to get there.