The new Inova X1 might work for you. Takes a single AA battery and is pretty bright for an LED light, not to mention being tough. Here is a great review:

http://www.flashlightreviews.com/reviews/inova_x1.htm

For $20 at Target stores you can't really go wrong. The old version throws a very narrow beam and has a dark-colored lens. The new version has a clear lens and throws a nice flood beam.

Only catch is some of the X1 lights are a little tempermental with the momentary-on switch. But that's a flaw I can live with.

Best $20 I've spent in a while!