How about a used computer store and get one off a dead unit.
I'll give that another try. At the swap meets I usually grumble about all computer crap. At last weekend's swap meet, the last "De Anza" of the year, I spent my time digging through junk laptops. That should teach me to be more tolerant. But I came up empty handed.
I think Firewire had a brief period of glory. Except for Apple, laptops didn't have it for a long time then dropped it when USB 2.0 showed up. Four-wire "mini Firewire" had an even shorter lifetime.
Today, I'll follow your advice and head to "Weirdstuff" the local computer wrecking yard.