currently amazon has a damn good deal on an rc tank with built in video camera. On the amazon search, look up spy gear. you should find the atv 360 for 51 bux(as of apirl 19th). This thing usually goes for about 130 so imo it's a damn good deal.
I bought the the spy video car($50 as well) a while back and managaged to pull the camera gear off. The stuff is pretty cool for the price. I'm still working on the car, but figured I'd grab this tracked version as well since it was a good price.