Anti-theft, sentry key immobilizer module (SKIM)

My radiator busted at first so the car sat for a few days until I got back from work out of town. When I got back, it had been broken into. They had taken fuses relays etc. They also tried to hotwire the car at first cause the steering column had been taken apart, but they managed to break my immobilizer (the black box over the key cylinder that reads the sentry key). Now my car won't run, I replaced everything but the immobilizer cause I can't find a place to buy one. Where do I buy one of these? Or can I get the ecu, key, immobilizer, keyless entry box in dash, and it run again? I can't go to the dealership I bought it at cause they closed down/went out of business. I really need this car running asap, what do I do?