The lowest price component in this Camshaft/valve parts-list fiche is the Spring,tappet Adj.
This Shaft,rr Cam is the most expensive of the items that make up this Camshaft/valve assembly.
Some items from this specific schematic: Shaft B,rocker Ar, Spg,in,valve Out., Shaft A,rocker Ar, Spg,ex,valve Out..