Some items from this specific schematic: Float,rr M/c, Cup Comp.,oil (ni, Clamper B,rr Brk, O-ring,14.8x2.4.
The lowest price component in this Rear Brake Master Cylinder (vt1100c2) parts-list fiche is the Pin,spring,2x10.
The most expensive part in this assembly is the Cover,m/c Res.tan.