A lot of those XML lights are similar to each other. Go on ebay and search for something like CREE LED bike light along with either Q5, T6, XML, Ultrafire and you'll get loads of results. It's not just limited to the 4 I said, there's loads, they were the ones that came to mind first. Some have built in rechargeable batteries, some take AAs, some take AAAs, some come in pairs, some don't. LOADS!