http://www.dealextreme.com/p/romisen...a-1x18650-7418
This one is great and very well made, worth way more than the 17$ they ask for. I own two of them, I have been gaming one of them for over two years now and it still works perfectly. It also seems to last forever with these batteries:
http://www.dealextreme.com/p/trustfi...s-2-pack-20392
I have charged them only twice in two years, the flashlight will literally last for months on a single battery. I use this flash light a LOT, especially when going camping and during field work. It lasts through rain without any problem, it has been shot, bumped, dropped, and it still works perfectly. It fits in all flash light mounts I tried and the best part is, it's almost as strong as a car light.