The component with the lowest price in the MINI CLOCK: 3,5 X 2,3 X 1 CM schematic is the Mini Clock: 3.5 X 2.3.
The sub assemblies and components that make up this Mini Clock: 3,5 X 2,3 X 1 Cm include this Mini Clock: 3.5 X 2.3, the most expensive part.