Since the promoter says they are fiberous, I'm going to guess they might be felt of some kind. So...
Go to a fabric store, and ask them if they have a non-synthetic felt. Even if you have to buy it off the bolt, a quarter yard shouldn't be much more than a few bucks- keep in mind that is a piece of material 9 inches long by 44 to 50 inches wide. Cut some pieces to the size you want. Test thier burnability. If you like how they flame, add something nice and stable for an excellerant, like wax, maybe with some aluminum or magnesium flake mixed in with it (just be careful during the mixing, but the wax will protect it from oxidation during storage).
Just an idea.