Some items from this specific schematic: Cam Shaft Comp,ex, Shim,tappet (1.80, Shim,tappet (1.42, Shim,tappet (1.22.
The lowest price component in this Camshaft/valve parts-list fiche is the Cotter,valve.
Of all the components used in this assembly the Cam Shaft Comp,in is the most expensive.