Build your own printed circuit board - Al Williams

The reason these items have come down in price over the years is because of printed circuit boards.
Whereas before you had to pay someone to physically connect (and repair!) wires for each component (a time-consuming and thus expensive prospect), now an error-proof, custom "PCB" is installed instead. Hobbyists and designers can now start their projects with a printed circuit board, rather than using it as a last step (and contracting it out to someone else, as was previously the norm).
It not only makes a more professional-looking prototype, but also makes it easy to mass-produce.
And the techniques are the same for the hobbyist working on a single project.This will be by far the most modern book on the market, with the latest and greatest techniques for producing intricate PCB's at a fraction of the cost of sending them out.