Some items from this specific schematic: Tube,6.5x9.5x500, Screw-pan-ws-cros, Washer,plain,stop Spr, Tube.
The lowest price component in this Carburetor parts-list fiche is the Screw-pan-ws-cros.
The Carburetor assembly is constructed from several parts from which the Carburetor-assy is the most expensive.