I would say that Circuit City would charge about $350 or so to buy and install. I think I paid $200 for the alarm itself and then the install was extra. I did not go with the window add-on, but I know it is available. Most add ons are in the range of $50 - $100. Keep in mind I am working from memory because I bought my system 4 or 5 years ago, just keep having it transfered to my new car.
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