This looks interesting, a cheap (2-3 hundred in kickstarter when it comes out) 3D printer that looks pretty robust. Its suppose to sell for $3-400 after kickstarter. Which puts it in the printrbot range. But it looks like it might be assembled and ready to go. Does 1.75 MM too.
http://www.3ders.org/articles/20140216-the-micro-3d-printer-launching-soon-on-kickstarter.html