Ha ha. $150 installed.
Just the labor alone will cost $150. It takes several hours to install a remote start/security system. There are usually at least 40 wires to connect, and it isn't easy working underneath the dash and trying to find all the right wires to tap into.
Plus it's even harder if you have a fairly new vehicle that has any kind of stock security system or special security ignition.
As a former professional installer, one of my favorite brands of security systems is Compustar. They are very reliable, and have tons of bells and whistles. They hardly ever "false alarm". The remote is a cool LCD 2-way remote that works like a pager. It lets you know the status of your car. It will page you and tell you if your car is being tampered with. And you can easily start the engine, and control the security system from inside any building. It uses a FM signal that can travel through concrete and steel walls.
I have Compustar security systems on my cars for several years, and they've never failed me yet.
I've installed a lot of security systems. Clifford's are good systems, but the Compustar is still my favorite. Compustar is a fairly new company, so you might not have heard of them before, but they make awesome stuff. They are the Rolls Royce of security systems. And you might be able to find a Compustar security system for under $300. Check
Ebay.
But you must also remember that a security system is only as good as the person who installs it. A bad installation can make a good security system act like crap. If you get a cheap installation, you'll save a little money, but it will be "false alarming" all the time, and not be very reliable.