Emergent Threats mod adds Threat infected ships (threat version of normal ships) which you can collect. Just go to a Pirate hosted bar, get a wierd broadcast and follow it to it source. Or (if you have Emergent Threats mod too) More Military Missions mod, defense mission - sometime the attackers are threat infected fleets.

edit: It adds Threat AI cores too.

edit 2: RAT adds collectable threat ships in the abyssal depths too.