Try the following site:

http://www.e-headlamps.com/headlamps.asp

Many of the headlamps mentioned above can be found there.

I picked up a cheap energizer headlamp, when I was at my local hardware store. Just for the situation you mentioned.

So far it's proved useful, in many ways. I now know exactly what I want from a headlamp without having forked oddles of cash. Yet it's still good enough to do the job it was intended for.