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Hyper Green Lvl5 is obtainable from both Bank Robberies, in order to get a lvl5 one, you need to have a lvl4 hyperchrome in your inventory.
Most traders aren't interested in trading for Green LVL5 anymore. Its slowly coming back to where it used to be demand wise: just an average hyper that's occasionally looked for. Its currently most similar to other LVL5's such as Yellow or Red/Purple, despite being higher demand currently.
With HyperGreen as a whole slowing down, a lot less traders are willing to trade for Green LVL5's, more specifically the duped one. While the clean one is still performing quite well, with it often going for base/slight overpays in mid-good demands, the same cannot be said for the duped variant. The duped variant is usually traded for base in mid demands, and sometimes lowballs in higher demands. The demand of duped Green LVL5 is comparable to that of Vantablack, Celsior or clean Orange LVL5.
Supply is widely distributed — no single holder owns enough to register as a hoarder.