Of all the components used in this assembly the Relay Assy,turnsignal Lamp is the most expensive.
The component with the lowest price in the TURNSIGNAL LAMP (VL800BL4 E03) schematic is the Nut.
Some items from this specific schematic: Screw, Screw(5x16), Washer(5.5x14x1.2), Bracket.