Rest assured that if I had the disposable income, I'd place little surveillance cameras around my perimeter. It sure couldn't hurt.
Revamp your definition of "disposable" and set em up. Everybody's got a hundred bucks they can eat without for a week, and it doesn't take much more than that for a basic setup. Bear in mind, you're typing on your monitoring and recording center while we speak, so that's already covered.
A couple of cheap cameras go a long way in the peace of mind business.