Multi-year contracts at $30 per month are the norm.
Now a startup is offering an intrusion system for $59 up front and just ~$3 monthly.
The company, Korner, has billed itself as the "Home Security Anyone Can Use and Everyone Can Afford" and raised more than $400,000. It is even less expensive than mega VC funded intrusion company Simplisafe (who we tested here).
We ordered Korner last year, and it finally arrived, shown below: