www.machinetools.com
Click on these various headings over there:
machines-metalworking
machining centers
machining centers, Vertical
Used or new, your choice
Haas is good, and you can go to their website, and learn as much as you like about running one.
www.haascnc.com.
I am only recommend Haas because you can get lots of online support from other Haas users if you run into trouble, and most everyone thinks they are very user friendly to set up and operate. I like mine a lot, and I graduated from a couple of old cnc knee mills myself. Its really not fair that you get a VMC right off the bat, you know