The component with the lowest price in the 004 CLUTCH [MOD:1199 R;XST:AUS,EUR,FRA,JAP,TWN] schematic is the Screw.
Some items from this specific schematic: Ring, Clutch Control Pin, Thrust Washer, Anti-rotation Insert.
The 004 Clutch [mod:1199 R;xst:aus,eur,fra,jap,twn] assembly is constructed from several parts from which the Primary Driven Gear Comp. is the most expensive.