The component with the lowest price in the GASKET KIT B schematic is the Washer,plug Drain 14.
A sample from the products for the Gasket Kit B include: O-ring,14.8x2.2, Gasket,l.cover (nas), O Ring,21.5m/m, Gasket,r Cover.
Of all the components used in this assembly the Gasket,r Cover is the most expensive.