I was shopping around in general looking to see if electronic stores sold the types of batteries used in mods. In my travels across the internet, I saw that Frys sells an 14500 lithium 3.6V that is not rechargeable. It costs more than a rechargeable one, so you sure wouldn't want to make a habit of it, but in a pinch, could you use this in your 14500 mod?
FRYS.com | LS14500-1
FRYS.com | LS14500-1