Simple PCB Design

Hi, I need a small PCB designed that can be used with a Raspberry Pi. It is designed to sit between a Raspberry Pi and a DSLR camera and trigger the camera's shutter. It would have the following components... (Budget: $30 - $250 USD, Jobs: Circuit Board Layout, Circuit Design, Electronics, Embedded Systems, Microcontroller, PCB Layout, Product Design, Raspberry Pi)