These are very handy, and a great price. I last bought 30 of them several years ago, gave many to friends who all found them very useful. Once you put one on your keys you'll be using it surprisingly often!
First 500 only.
Link here: http://www.meritline.com/superbright-led-keychain-flashlight…
Edit: Below are the ones I've used previously, and I think they are the same as the deal at meritline. Even the DX deal is quite good value, but the meritline special is even half the price again.
NOT THE DEAL: http://www.dealextreme.com/p/black-flashlight-keychain-22000…
Love the effort that meritline go to with their videos. Did you know that Meritline commission an original composition for each new product video?
Seriously though, this clip is slightly amusing when he turns on light no.4, you can almost hear the guy thinking out loud "what do I do now"