Try a dive shop. They are popular with scuba divers for night diving. One thing about Cyalumes is that they often go dead in the package - very uninspiring when you need them. I have found that the version sold in marine stores and USCG certified for attachment to PFDs works very reliably. I have kept several around long after their expiration date (like nine years) and they have always provided light when activiated. I hope this prompts a war story from Chris.