Your best bet is probebly E-Bay, if they are the ones im thinking of they were made by Decipher games and carried on through the 90s / very early 00s , they also had the card rights the Star Wars CCG from 1995 onwards till around 2002
I used to collect the SW Decipher cards, still do - just need around 6-7 left of the Ultra Rares and the Tourney foils, i go to conventions to get them signed by the actors who played them
I loved collecting those cards too. And yes, the other card games out there made it hard to complete. With the economic slow down, most card games and role playing games too a big hit. Not to mention, the Preimer Beta white border edition's numerous print and reprints all but made that set worthless.
I mostly find them on ebay. Very rarely can I find them hidden in remote card shops, mostly neglected and religated to the dust. It is because I have bought up the store owner's entire stocks that I have been given the nickname "Liquidator Brunt".
It would be nice to see some of the characters, ships, locations, and events(Interrupts, Events, Incidents, etc.) make an appearance in this game.