There must be a market for these teeny tiny cameras, which is why Thanko just released another one. The MAME-CAM DX [JP] is miniature digital camera that’s currently only available in Japan, but you can probably find a way to get them in the US thanks to importers.
The MAME-CAM DX weighs only 14g (less than 1/2 an ounce). Thanko claims that it can record video in HD, with a 1,280×960 resolution at 30fps. Still JPEG images can be shot with a 3,264×2,448 resolution. It can also be used as a voice recorder. All files are stored on a microSD card, so you’ll have up to 32GB of storage if you get a big card.
You can get the Mame Cam from Thanko’s Japanese website for ¥7,980 (appx. $99 USD). Otherwise, contact Geek Stuff 4 U and see if they can import one for you. But you might want to order a few extra, because at this size, you’ll probably lose at least a couple along the way.