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Hyper Pink Lvl4 is obtainable from the Crown Jewel (also known as Casino) Robbery, in order to get a lvl4 one, you need to have a lvl3 hyperchrome in your inventory.
Pink LVL4 has been affected by Pink LVL5's performance and there has been a noticeable demand spike for it. As of now, Pink LVL4 is pretty hard to get for base, and is sought after by many traders, making the demand change needed.
Supply is widely distributed — no single holder owns enough to register as a hoarder.