The component with the lowest price in the TURNSIGNAL GT80G schematic is the Ybs67-8 Washer, Spring.
Some items from this specific schematic: Screw, Lens Fitting (3x32), Front Flasher Lamp Assy(r.h), Collar, Flasher 1, Ybs67-8 Washer, Spring.
Of all the components used in this assembly the Front Flasher Lamp Assy (l.h) is the most expensive.