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The Galactic Carbon was obtainable in Season 2: "Out of This World" by reaching level 8.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
Galactic Carbon is currently performing terribly, its being mass dumped by its owners and cannot get anymore than 4M at the moment, with some of its most common offers at the moment being 3.5M items with small adds or JB8 (even those are quite hard to get due to Galactic having quite low demand and being massively avoided by traders).