Hello!

For some time the topic of CNC has been on my mind more and more.
I have no experience with such machines and I do not know what to look for.
I'm mainly interested in engraving and drilling in aluminum, if it's possible to cut something it would be great, but it probably involves a bigger budget.
I'm writing about CNC3040 because a machine with such dimensions seems to be perfect for the beginning.

And most importantly, how much can it cost?

Not sure how that relates to vintage tools, but good luck on your research.  I recommend a Google search. It is absolutely amazing what Google knows. 

There is a Facebook group "Machine Tools For Sale", you may find what you are looking for with them!