The component with the lowest price in the E-15 schematic is the Bolt,flange,6x12.
This schematic depicts all components used in the Cn250 Fusion 2004 (4) Japan Mf02-210 E-15 partslist.
Some items from this specific schematic: Crank Case Comp.r, Guide,rubber Spg, Bolt,a Stud 8mm, Bush,inner Engine.