I have also been experimenting with traditional fire making methods but where I live I cannot find any flint, the only thing I have locally is Quartz which also produces a spark but it is smaller and colder.
Try this link:
http://www.dixiegunworks.com/product_info.php?products_id=3673From my experience with a flintlock rifle I made from a kit a few years back, a natural flint striking a hardened steel can produce a huge shower of sparks, which are at least hot enough to be painful. Very painful.
Frank2135