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Haven't tried those on eBay, but have used aliexpress with good results (except with a set of collets). Including spindle-motor and stepper-motors...
Some interesting points at the bottom, in the comments section: http://www.instructables.com/id/Raspberry-Pi-Alamode-CNC-Controller/?ALLSTEPS
Posted link to this discussion on the OpenBuilds Google+ group - hope you don't mind, but this is as important as the CNC hardware IMHO.
About ChilPeppr and Raspberry Pi (and BeagleBoard and other mini-computers with Grbl for that matter): All that's needed on the mini-computers are...
@Rural : Sorry, didn't really notice the part about open source. Talking about open source, I think there is a "danger" in those projects where...
In the Free area of CAD there is also "Autodesk 123D Design" and "DesignSpark Mechanical". One can use ChiliPeppr (JavaScript in browser, seems...