went out to a friend's land last dove season and someone had an electric thrower mounted in the back of their truck. thing would hold around 1,000 clays. you could set the parameters on it and tell it the limits of where it could throw, then flip the switch and it would just move all over throwing clays randomly...man, that was a good time! i have no idea who made it, but i've seen similar things in excess of 2 grand.
i'm really not much into clay, they don't taste nearly as good as dove or quail