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Hyper Yellow Lvl4 is obtainable from the Cargo and Passenger Train Robberies, in order to get a lvl4 one, you need to have a lvl3 hyperchrome in your inventory.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
Yellow LVL4 has been performing amazingly lately, with it almost always going for 11-12M offers, with owners often declining Raptor for theirs (despite it currently being worth more than it). Its most common offers include: Raptor + adds (around 500K), Aperture + Wedge or x2 Carbonara (occasionally with adds).