The lowest price component in this Camshaft / Valve parts-list fiche is the Seat,vlv.spg.in..
Some items from this specific schematic: Camshaft Comp.,ex, Cotter,valve, Valve,in., O-ring,21.5x2.
The Camshaft / Valve assembly is constructed from several parts from which the Cam Shaft,in.rr is the most expensive.