http://www.dealextreme.com/details.dx/sku.3371Slightly 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.4151http://www.dealextreme.com/details.dx/sku.5790You 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.13658http://www.dealextreme.com/details.dx/sku.11074or 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.3246The Romisen MXDL RC-G2 Cree Flashlight Gray is a great little AA powered flashlight. At $11.30 it is an absolute bargain.
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