You poor thing. I hate it enough that their are cameras everywhere at work. I can't even begin to imagine them in my home.
There are stores everywhere that sell this stuff. And since the nanny cams became available years ago, any Joe Blow can buy them. There are gazillions of sites like this (a random hit, just to show you one).
http://www.spyville.com/
As for hunting them down, I found this:
http://www.4hiddenspycameras.com/ulbugdetzzap.html
But maybe someone knows an easier way to detect these devices?
Anyway, good luck. I don't envy you being in that position.