http://thenxtstep.blogspot.com/2009/...t-of-mine.html
Found this recently, looks really interesting. Instructions on how to build your own CNC machine; will be released in November along with a website. The CNC can be built for ~$800. That's a lot cheaper than buying one. However, some will argue that depending on your team, it's probably not worth it. The big dogs have enough money and resources to buy their own CNC machines, but everyone else could/has been getting along fine without them. The big deal is that they can machine parts, specifically complex ones, quickly and accurately. So that's something to be considered. My team was vaguely thinking about buying an old, used one, but it was a dream.
Hope that's helpful/interesting!