Where can you find the A-bus in crackdown 2?

The a-Bus can be found in many locations throughout the city, one place to look would be in heavily guarded cell strong holds, and occasionally you can find it being auctioned off by random civilians in alleyways or parking lots and other random locations, but note that you do not have to buy the vehicle as that is impossible. you simply have to take it and store it in a nearby drop zone.