UAV's entirely flown by computer are also old-news. the cost puts them firmly in the "professional use" league.
A GPS-controlled Ardupilot quadcopter that is autonomous or computer controlled via a radio link costs around $500 self-made or a bit more if bought ready-made. Many kids buy them, definitely not professional or prohibitive cost wise.
Just a couple of clicks to define waypoints coordinates, height and timing and off they fly. Should try flying one that way shooting video of your plane or flying just in parallel next to you.
You can find the mission planner software for them here:
https://code.google.com/p/ardupilot-mega/wiki/Mission