You can buy small Halon extinguishers still, but only
at your local
civil airport for your plane. I have recently heard, however, that
there is a replacment gas that does just as well, but can't recall
its name. Does seem that it starts with an "H", though.
I certainly hope its still around. I have a couple small ones, that I
figure were well worth the price, and I am not getting rid of them until
the dial is seriously below green. To me a typical powder system is
worthless, ever see the mess those make? Better to let it burn.