http://www.dealextreme.com/details.dx/sku.3371

Slightly more than the $10 at $18, but is a very flexible design.

It can use both RCR123s or a single 18650 reachargeable lithium cell. 2 18650 cells and charger are about $19

http://www.dealextreme.com/details.dx/sku.4151
http://www.dealextreme.com/details.dx/sku.5790

You can also use other drop in modules such as Cree XR-E R2-WC 5-Mode 250-Lumen LED Drop-in Module. There are also high efficiency Cree Q5 Drop in modules as well.

http://www.dealextreme.com/details.dx/sku.13658
http://www.dealextreme.com/details.dx/sku.11074

or a high Powered 3W InfraRed IR Drop-in Module

http://www.dealextreme.com/details.dx/sku.12625



IR flashlight using IR camera (Sony F707) and Daylight IR filter + ND8 filter.



Virtually no visable light emitted....

There are also UV modules and 3.7V 10W Xenon Bulb modules available as well.

http://www.dealextreme.com/details.dx/sku.3246

The Romisen MXDL RC-G2 Cree Flashlight Gray is a great little AA powered flashlight. At $11.30 it is an absolute bargain.