If you look at the accessories tab on the page you linked to, you need either of the ones that are "4 pin to 6 pin" cables, because Macs use 6 pin FW400. Or you can get a 4 pin to 6 pin FW cable from any other source. Here is a cheaper example from Amazon.com....
Under accesories, the iLINK (4 pin to 6 pin) listed for $39 extra would be the firewire cable I believe you're referring to.
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P.S. - Sorry for the repeat. I'd sworn those two posts above weren't there when I entered send