How much time do you have ?
Work envelope ?
Desired resolution and surface finish ?
Cost range..
A tiny 100 mm envelope cnc mill will cost about 7000€ in metal, 12.000 with better screws and slides.
Add controler of choice.
Fwiw...
My very large industrial VMC cost about 100k, and took over 15k hours overall, including a lathe + industrial cnc
refits and learning to machine.