I assume you mean the alarm, not the Stowaway box? The alarm is an AudioVox that they sell at Circuit City among other dealers. The prices range from $300 to $450 with about a $90 installation charge. Some vehicles require a relay box to hold the key chip (if you have such a key). The relay box is about $30. I think the temperature sensor one is the Audiovox 996A. I can't read my notes that I scribbled. There were also some nice Viper security boxes there. The newest models have a display key fob, that provides definitive feedback, like showing exhaust on an icon of the car when it actually starts with the remote start.
I started out looking for just a remote starter.
If it was the Stowaway box, do a search on Stowaway2 and you'll find dealers and a direct link to Stowaway.