<50c and free shipping these are pretty hard to beat.
They are very bright (2x3V batteries and no regulator) they are well enough built that they are pretty water proof.
They have a switch to lock on in addition to press to light but with no regulation the battery would only last a few hours.

http://dealextreme.com/details.dx/sku.1100 or (black http://dealextreme.com/details.dx/sku.1253)