Jason asked, "Cool idea Dale! What did you seach for on eBay? "firesteel"? And how does it come? I one long rod that you have to cut or smaller pieces? Also, what's the weight of everything with the waterproof case?"
The case with firesteel and striker weighs 1.2oz.
Search on ferrocerium, firesteel, fire flint, or just go to http://www.ferrocerium.com/main.sc
This guy has some deals and bulk too: