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Hyper Purple Lvl3 is obtainable from the Power Plant Robbery, in order to get a lvl3 one, you need to have a lvl2 hyperchrome in your inventory.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
LVL3's are performing quite well currently, Purple LVL3 being no exception to this. It can get 8.5M in mid demanded items relatively easy, and may even get overpays in lower demand, due to it currently being quite a decent item to trade for at the moment.