if you have an HK droid you can get one from him. The mainhand weapon he uses has a purple crystal in it. (so far 3 of mine did) I ripped the crystal from his weapon and put it in my blaster or lightsaber.
Ah now we're getting somewhere
So, i guess you know what my next question is : how do i get this HK Droid ? It seemed to me that you had to be lv.50 to start the quest to get him, but maybe i'm mistaken ?
As far as where you can find more information...this is probably one of the best places. Also check out TorHead or dulfy.net.
Ok, but the thing is that i really dont know where to start ... maybe this is a bit off-topic then, but could you give me the basics of all this high-level-currency PvE gear ??