This Axle, Main is the most expensive of the items that make up this Transmission assembly.
Some items from this specific schematic: Brg,r-b 6304 52mm 150g Nt, Nut (1l8), Gear, 3rd Pinion, Washer, Plate (537).
The most reasonably priced component used on the Yz125 2003 (3) Usa Transmission is the Screw, Countersunk(56j).