Dan,

Here's a couple I found through Google.

http://www.alarmcontacts.com/
http://www.homesecuritystore.com/index.html
http://home-automation.org/Security_Systems/

Neighbor that got hit is having an ADT system installed today. $250
installation, $30/mo monitoring.
Homesecuritystore.com has a link to monitoring for $9/mo. Haven't talked
to anyone about that yet, wonder just how good a service they can really
provide at that price. But with the neighbor's ADT install it's obvious
they are offering the system cheap and making $$ on the monitoring.

Jon