I’ve watched the 3D printer scene for a while now… it’s getting pretty tempting to buy (or put together) one.
Here’s a site that has a pretty comprehensive list of 3D printers and their price-tag.
http://www.3ders.org/pricecompare/3dprinters/
In other areas of the 3D printer world:
There are plans to invent a sub $100.00 model though it isn’t there yet.
And there are even plans for 3D printer/CNC milling machines.