You can find them either as drops, already in dropped weapons (you can remove them), or as a quest reward. They can also be crafted by artificers.
Quest rewards, and I'm fairly certain there are a few vendors that sell them.
It is a rare crystal and the only time I have seen them is on higher level people. I would expect that they are either dropped from high level flash points, or from higher level quests.
It is most likely a drop on a high level NPC. Here is a link to one on TORhead http://www.torhead.com/item/3IVjBZH#comments
Artifice is your best bet! Can't wait to have red in one and purple in the other.
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