Actually I have never bought from Sparkfun myself, preferring Pololu and its associates and various others. However, my comment should be read in the context where Sitherus was professing ignorance on this particular topic, which I presume you are not, so I gently prodded them toward information already existing to answer their questions and, one would think, easily findable. Different people need different levels of support. Not all recognise that information has a cost which someone has to pay.