The component with the lowest price in the TURN SIGNALS schematic is the Washer.
Some items from this specific schematic: Lamp-assy-signal,rr,l, Screw-pan-wp-cros,4x8, Bulb,12v 10w, Lamp-assy-signal,rr,r.
The most expensive part in this assembly is the Lamp-assy-signal,rr,l.