The component with the lowest price in the TURN SIGNALS schematic is the Screw,tapping,5x16.
Some items from this specific schematic: Socket-assy,signal La, Lamp-signal,fr,lh, Washer,signal Lamp, Lamp-signal,fr,rh.
This Lamp-assy-signal,rr L is the most expensive of the items that make up this Turn Signals assembly.