I have found the perfect security system, hardly any cost required. Christmas lights. Because apparently if you turn them on full blast, they will blind any intruder.
I walked up to my front porch last weekend trying to bring the groceries (read: Bagel Bites) inside and the lights were on maximum overdrive, flashing like it was a rave. Literally disorienting as I was trying to open the door. Guaranteed any burglar is skipping over your house if it looks like the screen of Dance, Dance Revolution and stealing from the Millers instead.
It has my full endorsement.