Yes, a low cost machine is really my only option. Like I said though, I don't have the time or mechanical skill (yet) to try to build my own so I'm looking to buy as much as possible.
The lumenlab micRo you link to looks good but I'm not sure that it looks any better than the ZenBot. It's hard to say though since I can't really find any pictures of the machine as a whole. I guess I'm asking: is there any advantage over the Zenbot that I should wait a few weeks for?
Precision is somewhat important. Like I said, I'm going to be doing double sided circuit boards. They're not going to have tiny traces or anything like that, I just don't want to purchase a machine designed for machining huge parts when I just need mostly small circuit boards. It should be able to comfortably do circuits like this:
http://youtube.com/watch?v=SlGcgQJRncc (look at the last few seconds of the video).