You'd be better off just making a couple before buying them. I mean, yeah it's convenient to buy them, especially the filled out ones like for d&d. But seriously... The connectors, solder, and wire for two will cost you like $5. maybe $10. and you won't have to wait around for someone.
Pretty sure it's this:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=H3824-ND
You might as well get them from here:
http://www.jammaboards.com/store/capcom-cps-kick-harness/prod_49.html