This mod will allow Tommy to illegally sell cars, and get paid for it. We steal any car, go to the port (on the second island, after getting into the car, the dollar icon will automatically appear on the map) and drive up to the pink marker. Sales revenue is always different. After selling a car, you get 1 wanted star. To sell cars, you must not have wanted stars!
P.S: Perhaps there will be a version of the script for Vice City on Android.