Slaves
From Universalwiki
The trade good slaves in the Andromeda Galaxy is the cheapest galaxy-wide cargo that will net a good amount of credits. While some may shy away from carrying such trade goods as Slaves and Narcotics, they are in high demand, especially in the outer systems.
Slaves can normally be purchased from a planet that is listed as "primitive" for around 140.0 to 160.0 credits per ton. Certain core planets will purchase slaves for around 150.0 credits per ton, but the outlying star systems will purchase slaves for up to 180.0 credits per ton, or more, increasing the profit margin considerably. A little less than 25% of the star systems outside the core will be looking to purchase slaves from cargo captains.