I saw this in the NY Times today "You will be able to download three-dimensional plans online, then push Print. Hours later, a solid object will be ready to remove from your printer."
http://www.nytimes.com/2007/05/07/technology/07copy.html?_r=1&hp&or ef=slogin
If you've got $15000, you are good to go. For the rest of us, check Wal-Mart in a couple of years.
There's a lot of these already out there called CNC Mills (http://en.wikipedia.org/wiki/CNC). Allows you to create from pretty much any substance.
Yes, still pricey, and you can't get anything like the D&D minis, but they are impressive (so, also, is the cost).