The component with the lowest price in the CYLINDER HEAD schematic is the Gasket(6.2x13x1.2) (nas).
Some items from this specific schematic: Guide,valve(os:0.3), Plug,spark(cr9eia-9), Plug,spark(cr8eia-9), Bolt(6x18.4).
This schematic depicts all components used in the Gsxr750 2012 (l2) Usa (e03) Cylinder Head partslist.