Just go to a Local Car Audio Dealer.. Try to stay away from the Best Buy Circuit type Stores and go to a Local Specialty store. Then get prices.. Don't really try to install it yourself because they are a pain in the arse. Pay someone to do it.. Its well worth it.. I know our Viper Alarms start about 220-250 Installed.. Thats a decent price for a Badass Alarm.
But the best thing about having a Alarm installed by a Certified Dealer because they will come with a lifetime warranty which is well worth it. I have not seen alot fail but I have seen some fail and DEI has one of the best warranties and back up anything they sell.. Great company and great alarm..
Now I just have to finish mine on my New Car.. I got the Remote Start and Alarm hooked up now I just need the Windows up and Down, Trunk Release (w/ adding Motor) Motion Sensor, Glass Break, and Voice Module.. Then I think she will be complete.