The component with the lowest price in the TURN SIGNALS schematic is the Nut,flanged,6mm.
Some items from this specific schematic: Gasket,signal Lamp (nas), Nut,flanged,6mm, Screw,4x20, Nut,flanged,6mm.
The sub assemblies and components that make up this Turn Signals include this Lamp-signal,fr, the most expensive part.