You can build the platform for around $50. Hobbyking has one aerial lift platform for about $35 and they also have a camera mount for under $20. Four motors and 4 ESCs will run you about $150, $29 for the FCC and $20 for props. If you already have radio gear you can use that or buy Turnigy for $70 and then lipo and charger. You can do it all for under $400.