Originally Posted by tuffluck
oh, well i meant putting something up at night while i sleep, specifically. again, i know it may seem unreasonable, but if anyone has access to my key that i don't know, i assume there is always a possibility they can come into my home unwanted. i was just looking for a cheap and easy way to keep them out even if they had a key. obviously during a showing i have to allow them access to my home.
Basically, you're looking for a little peace of mind. Very understandable.
I'd recommend getting some of these cheap magnetic door/window alarms. They won't keep anybody out, but they make one heckuva lot of annoying noise if a door or window is opened.
Beyond that, if you're really terrified, get a gun.