I have lots of LED flashlights (see my web site for a few). I really like the $6 white-LED flashlight I currently have on my keychain. Here's a
Link. It runs off 1-AAA, so batteries are cheap, and it is pretty bright. You twist the endcap to turn it off, so it is unlikely to turn on, as long as you unscrew it enough. They have them in silver(ish) at Target, and in lots of other colors at WalMart (Mine's gold).
They also have larger models of the same flashlight. Check out the
companie's web site for all their products.