The UltraFire WF 501c style hosts are reported to be useable as a 2x AA cell light if you cut a tube to length to hold the cells. That host is designed for 3x CR123a sized cells which happens to be the same length as 2xAA cells, just larger diameter. You would have to replace the driver on the LED Drop-In though.
http://www.manafont.com/product_info.php/taiwan-3w-380nm-uv-flashlight-dropin-module-42v-max-p-5697 with an aftermarket driver should be a good choice. That drop is is the one I use looking for scorpions and it's great...