With the handy Clap Camera, you can take pictures on the sly and transfer them to your laptop with ease. It's roughly the size of a typical flash drive and fits right in the palm of your hand. It's so tiny that most people wouldn't think that you're taking a picture of them when you point it in their direction. It's equipped with a 2-megapixel sensor so the shots you take should be decent enough.
When you're done playing photographer, just remove the cover on its end to reveal the USB connector. Just plug it right into your laptop to access your pics.
Get It: $50