In truth, I have found that the brightest and cheapest chem lights are available in the emergency aisle at WalMart. They cost $1.67 for a two-pack and are very bright (green) in comparison to Cyalume which used to be my favorite brand. If you are looking for chem lights in bulk, nothing beats ebay (even though the cheapest can be several years past their "expiration" dates. On ebay, you will typically see cyalume or other brands. Stick with the 6" ones or even 4" ones to save a little money. I use chem lights a lot (especially for fishing off the local piers) and find that I am still using cyalume green ones with a 2013 expiration date with no problem. Yes, they are a little less bright but to date I have only had roughly 5 of over 150 that have not worked. I stock them religiously however and have them throughout my house and garage.