The component with the lowest price in the HEADLIGHT(S) schematic is the Bolt,flanged.
Parts such as the Headlight(s): Rim-lamp, Collar-battery Case, Bolt,flanged, Screw,focus Adjust,4x are included in the Vn1500b4 Vulcan 88se 1990 Usa California Headlight(s) parts fiche.
Of all the components used in this assembly the Headlamp is the most expensive.