Hi everyone!

I'm not affiliated with the OpenPilot project, but I figured it couldn't hurt to spread the knowledge - the OpenPilot Revolution ('Revo') platform is available for a limited time (orders close on November 5th).

The Revo is a very capable flight controller, based on the STM32F4 MCU, with a great IMU, built-in telemetry radio and a 5hz GPS.

I suggest you head on to http://www.openpilot.org for more information, but the basic costs are under 200$ for a complete kit (flight controller with onboard radio and GPS + ground station radio module).