Of all the components used in this assembly the Rear Flasher Light Assy 1 is the most expensive.
The component with the lowest price in the TURNSIGNAL - FLASHER LIGHT schematic is the Screw, Tapping (25k).
Some items from this specific schematic: Nut (1a2), Stay, Flasher, Rear Flasher Light Assy 1, Screw, Pan Head (e56).