What Is The Least Costly and Easiest Home Security Monitoring System Available ?

I will give you an answer based on my experience at ADT in 1987 where I worked as a residential alarm designer. Of course that was a long time ago and definitely not a true and positive recommendation. That is your province. In those days we always installed what was termed an interior system which protects the premises from within. You cannot stop them from the perimeter if they are determined. Hardwired only is a motion detector(s) and every door opening contacted and a panic button. Many companies even today will give you that for no cost to grab the monthly monitoring fee (the razor blade vs, the razor theory). Check this by calling ADT or your very best local concern. Jay Adler, Music Critic

<a href="http://www.eyewitnesssurveillance.com" target="_new">Remote Security Guard</a>

Eyewitness Surveillance has implemented proprietary, state of the art software that detects motion hundreds of yards away. Security agents specifically trained to your property will respond to any threat using a two-way audio system. These systems include covert microphones and speakers strategically placed throughout your facility, allowing our agents to listen and speak directly to any prospective threat.

LaserShield makes a pretty good unit for under $200.  I have one and am happy with it.  Here is a link to read Laser Shield Customer Reiviews that may be helpful.

Not sure that you want to cheap out when it comes to home security.  I would recommend CCTV systems like these http://www.securitystoreusa.com/CCTV-Surveillance-s/5199.htm

Definitely comparison shop, but you get the idea.