Hello,
Rather than a dead display, the cause might be a broken wire, faulty grounding or a loose sensor.
Toyota's electric systems usually have a component, apart from the circuit fuse, that fails before more complex parts suffer damage.
If I remember correctly, the outside temperature sensor is in the lower front grille. The inside temperature sensor lives in the roof liner above the front seat.
You should check the sensors, the fuses and electrical continuity. Wiring becomes brittle with age. However, chances are the display is still alive.
Last but not least, if Partsouq does not have it, it does not mean it is not available elsewhere. Some stuff is long discontinued but it can still be sourced from other vendors. And there are wreckers around when everything else fails.
Juan