Of all the components that make up this Carburetor the Screw, Pan Head (j10) has the lowest price.
Parts such as the Carburetor: Clip, Jet, Main (#120), Ring, Needle, Screw (3h5) are included in the Sr250 1981 Exciter1 Usa Carburetor parts fiche.
The most expensive part in this assembly is the Carburetor Assy 1.