There are some smaller machines out there, but they still cost money if you want to hold decent tolerances (those mini ones up above aren't really worth a damn for accuracy). One that we have at my school is the Haas OM-1 (here's a link
). Also, it does hold very tight tolerances...we use it to do micro-machining and little stuff like ornaments and desk objects. With a 30,000rpm spindle, it's like a dremel on crack and steriods lol.
For the price though, I'd just buy a full-size CNC, like a VF-2.