You normally still get them (only one, so choose wisely, but on the most recent Tribble it says if you dump it, you can reclaim another) from Jiro "I can't stop talking and being incompetent at my job" Sugihara in Quinn's office.
Also, it's been a while since that change, but you can no longer sell it on the exchange.
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Found it again, from the 11/18 Tribble release notes (this means it's NOT AVAILABLE on Holodeck yet, so don't try this at home, kids!):
Exchange Officers:
*Diplomacy/Marauding exchange Bridge Officers are now set to limit 1.
**This means that the player can dismiss one and then get a free replacement from Ambassador Sugihara or Marauder Kazzgur, should the player desire a different officer.
*Upon reaching commendation rank 4 in Diplomacy or Marauding, the player will be granted a mission to go and get an exchange/renegade officer, which now appears in the mission log.
**This does not change the legacy white/common quality exchange officers, only the current purple/very rare quality ones.
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Also, it's been a while since that change, but you can no longer sell it on the exchange.
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Found it again, from the 11/18 Tribble release notes (this means it's NOT AVAILABLE on Holodeck yet, so don't try this at home, kids!):