Attached Link: RepRap

Here is another one that has a target price of $400. Interesting to note that one of the goals of the project is having the fabber make copies of itself. The group is developing a "bootstrap fabber" (read simple and slow) that can be made of wood and other easily obtained parts. That one is used to make the parts for the more advanced one. After the parts for the advanced fabber are produced and the device built, you're obligated by the license agreement to produce the parts for two more fabbers to give to other people. There are some videos on the site showing a prototype in operation.