The component with the lowest price in the MUFFLERS ('78 C1/C1A) schematic is the Washer-spring,8mm.
Some items from this specific schematic: Pipe,exhaust,l.h Insi, Bolt-small-fine,10x60, Nut,lock,8mm, Gasket,manifold Exhau (nas).
This Muffler,lh is the most expensive of the items that make up this Mufflers ('78 C1/c1a) assembly.