The most expensive part in this assembly is the Camshaft-valve.
The component with the lowest price in the CAMSHAFT(S)/TENSIONER schematic is the Bolt,flanged,8x35.
Some items from this specific schematic: Chain,camshaft,82rh20, Bolt-flanged 10x25, Washer,10x22x3, Screw-pan Head,6x12.