Found some great deals at my local XS Cargo
-Led book reading lights (including batteries) 1.99 each
-Airsoft rifle (for BR modification) 29.99
-Led hat light 4.99
(disassembled led)
I'm sure you can but you probably need a decently good battery like a 12. Personally unless you don't have anything better to do i would use the leds in the tutorial for hooking leds to a helmet.
You don't even have to solder. You can even get small rubber tubes that you put over your wires, and they shrink to size when you hold a lighter under them.