Fitting a hidden camera in a light bulb is a great idea. Because it attaches to the main electrical system, there's no need for batteries. And, since it's already in the wall, you can wire it up to whatever you want. Since it's a light bulb, it'll always be light enough to get good spy shots on whoever you're peeping. The only downside is nobody ever really looks directly at a light bulb, so you're never going to get anyone straight on. Otherwise it's not too bad.
Available now for $139.99.