The lowest price component in this Track Drive 2 parts-list fiche is the Bolt, Flange (1e2).
The Cf300m Inviter 1988 Track Drive 2 consists of thirty pieces with the Housing, Chain being the most expensive.
Some items from this specific schematic: Bolt, Flange (7t2), Sprocket, Chain Drive(12t), Screw, Bind, Washer, Plate (8j5).