www.dealextreme.com has both a wide variety of flashlights with various emitters including the 900 lumen P7 that this has, and the emitters, controllers, heatsinks, reflectors and glass that you might use to build from scratch. Here's the flashlight DIY section: http://www.dealextreme.com/products.dx/category.917
and here are SSC based flashlights (there are also Cree flashlights and others): http://www.dealextreme.com/products.dx/category.903 There are a number of P7 flashlights in the $35 range. The cheaper ones take a single 18650 so they'd want about 3.6 volts input. Some take two and will take more, but since you're regulating down anyway it probably doesn't much matter which one you start with.
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Here's the flashlight DIY section:
http://www.dealextreme.com/products.dx/category.917
and here are SSC based flashlights (there are also Cree flashlights and others):
http://www.dealextreme.com/products.dx/category.903
There are a number of P7 flashlights in the $35 range. The cheaper ones take a single 18650 so they'd want about 3.6 volts input. Some take two and will take more, but since you're regulating down anyway it probably doesn't much matter which one you start with.