I found the ebay was the most likely source outside of someones private stach or parts car.. It took awhile but the same week I found mine, 2 more came up to auction.. one of those streak things you see on ebay.. If i see one i will find you.. it was like $25 for new boot included..
i just did a quick hit at samb vw and there are a couple there but it is hard to tell form the pics, but there is definatley one on a fuel pump there too.. just a thought and you may have to buy the boot seperate, cheap harness though.
last shot check this link/post from 2 days ago here at 914 world the offerer has 3 port pump with leads, i guess meaning the harness, maybe he will part the "leads" and just keep his pump to sell, would not hurt a fuel pump sale at all to not have the harness.. just the final thought good luck..
http://www.914world.com/bbs2/index.php?showtopic=113776plus there is always jeff bowlsby's private stash