Some items from this specific schematic: Washer,28.3x34.0x1.6, Bearing-ball,tmb3/28j, Bushing,28.1x31.0x11., Gear,input 2nd,19t.
The Ball-steel,5/32 is the lowest priced item on this Transmission schematic.
Of all the components used in this assembly the Shaft-transmission In is the most expensive.