Canon once sold these telephoto lens keychain flashlights in its online store for $7. They’re out of stock now, but they sometimes appear on eBay for about $15. They perform quite well in low light situations.
Image credit: Photograph by gary_camera
Admit it, you just posted that for the low light situations punchline.
but are they compatible with http://www.petapixel.com/2011/09/22/chobi-cam-one-arrives-in-the-us-as-the-worlds-smallest-camera/