it was free for me becuase I had the wire and connectors already; it wouldnt' cost more than $5 though if you had to buy the stuff

I wired a starter kill switch into my stock foglight switch. So now when I don't want my car stolen, I just turn off the foglight switch when I leave the car and then it won't start until that button gets pushed in and the button also still controls the fogs too.
It is very simple wiring and only took about 15 minutes (since I was taking some pictures too).
I did a little writeup on what I did since I was bored here at work
http://www.geocities.com/bracecraig/maxima/kill

 

wats ur address.... just kidding

 

Nice mod.... I've been looking for different ways to wire in a kill switch or add more security to my car. The wiring seems pretty easy too. Nice write up as well
-hype