While there is great satisfaction in home building PCBs, adding up the cost of the blank PCB, etchant and the drill bits comes to over $4 per board. But for $6.25 a board the whole thing can be made professionally. This Instructable takes you through the steps to create the Gerber files that the PCB manufacturers need. The total cost was $75US including shipping for 12 boards. 3 boards would be about US$62.
This Instructable builds on some great work at http://www.instructables.com/id/EXU9BO166NEQHO8XFU
(Draw Electronic Schematics with CadSoft EAGLE) and http://www.instructables.com/id/EZ3WN1QUKYES9J5X48
(Turn your Eagle schematic into a PCB). Eagle is free.