I'm not sure what you're really asking us, a quick call to a local contractor should give you a ball park. Do diligence calls for a quote from 3 to make sure you're getting a good deal. But cost will vary by region as the labor is important.
I guess as a (huge) ballpark, $1,300? I just saw that on toh.com but thats probably for a bigger house. That being said, I assume that the system works mostly on the cost being in the set up, not in letting it run.