If you mean HSS pieces I have three, two of which are tooling bits, one is unused and the other is partially used. The third piece is the rosetta knife. As I said if you go to any machine shop and ask if they have either high carbon scrap or High Speed Steel scrap most places will just give it to you. Most scrap comes in all shapes and sizes but as HSS is expensive to make and normally only used for tooling bits and such the pieces should be small. If you want to put lanyard holes or something in a piece that doesn't already have them you will need to have the cut with a waterjet as it is nearly impossible to drill that stuff and no machine shop will even attempt it.

If you get high carbon steel scrap you can have it machined or do the work yourself if you have the tools so you can make a striker in any size or configuration you want. You can drill it pretty easily and nearly any machine shop can heat treat it for you. While carbon steel does not spark quite as nicely as HSS it still does a great job. Coupled with being able to shape it to your needs and put a hole in it if you want for attaching to a keychain or whatever it might be your best bet.