I'm cleaning out all my old computer stuff (see
here for more info on that) and I seem to have collected about 50 FireWire cables in various forms 6-6, 6-4, 6 to 4 adapters, FW 800, FW400 to FW800, 1 ft, 10, ft, and on and on and on. If you're wondering why so many, well, you can't be more confused than my wife.
If you need a FW cable, chances are I have it. Send me a request and I'll let you know. Price, including shipping, will be 6 gifted songs on iTunes or 3 videos (I'll choose, thanks).
If you need a wacky USB cable- I may have that too.