Copper

Category:Resources
Highly conductive metal used heavily in energy storage components.
Used in: Battery modules.
(spoilers!)
 
Common sources: Harvesting of resource drops from broken-up asteroids, bonuses from surveying Anomalies, purchases from Trade factions on the cheap (e.g. Kyrnan, Goryr, Wiskamug, Island Traders)
Remarks: If you build up a reserve of approximately 200-400 Copper plus whatever you need for your energy storage needs, you should have enough to purchase from the Ermyr anything which they have to advertise.