I recently got a petrol powered helicopter, you can't actually control it, it's free flight, it controls you!!.
0.5cc engine, and it was £5 (about $8) coz there were some parts missing, which I promtly went and bought for 40p (60cents)
I'm getting a petrol car in the next week from my uncle, I know nothing about it, other than it's fast as........uhm.....a very fast thing.
I'm kinda half way through building a plane aswell.