Some items from this specific schematic: Washer 434172160000, Washer Plate 156171160000, Gear, 5th Wheel, Shim, Drive Axle (0.5).
This Axle, Drive is the most expensive of the items that make up this Transmission 250b/c - 400b/c assembly.
The component with the lowest price in the TRANSMISSION 250B/C - 400B/C schematic is the Circlip(1ey).