Where can I get the Sparki source files?

We post all the things on our Github – the usual place to find most Open Source files: 
https://github.com/ArcBotics

If you’d like to 3D print your own Sparki, or want to alter the parts, the source files and complete assembly for it are posted here on github:
https://github.com/ArcBotics/Sparki

That’s also where we post the source for the arduino code, and the example code.

If you’d  like a set of the Arduino file pre-compiled into an Arduino library that fits the 1.5 library standard, so that you can use it with your Arduino install, you can find that in the Downloads page:
http://arcbotics.com/downloads