If you need a flint source, I've been pleased with the flints I got from Neolithic. If you buy a dozen, the price to your door will be $18, IIRC, so $1.50 each. I've been well pleased with them. They are ground to give flats for the cock jaws, so if you're a stickler for that, you won't like them, but otherwise, they are good, durable English flints. Well, I got English flints, they have White Chert and some other flavors, I think, too.