Okay, let me explain since more than one person seems to be confused here...
The Derelict Lightsaber you want is a Cartel Market weapon ONLY. It comes from the Bounty Supply Corporation, or the BSC for short. Any vendors that are labeled with "Bounty Supply" are Cartel Market related vendors. The ONLY way to get reputation for these vendors is by buying one of these Cartel Packs: Contractor's, Freelancer's, Pursuer's, Tracker's, or Opportunist's Bounty Pack. Whenever you open one of these packs, you will get either a Cartel Market Certificate, or a Green, Blue, or Purple reputation item. You use the reputation items to gain the needed reputation to buy stuff from the Bounty Supply Vendors. I Quote.
Thanks mate. Worked perfectly both Kira and my Jedi Gardian have derelict light sabers now.