Data Cable for the 770SH

From the comments I read here and on various forums, it seems like the data cable is the holy grail of the 770SH. Nobody, Sharp and Vodaphone included, seems to take responsibility for its retailing.

There is a solution that's become apaprent, however. Among others, Foxx notes that:

'The data cable is the same as many vodafone/sharp handsets, like 903sh, 902sh, 703sh, 550sh, GX29, GX30i, etc. I've asked my friends who owns any of them, all negative. None of them has that legendary data cable XN-1DC30.'

Also, Anonymous says:

'I use my old sharp gx30 data cable it works fine with the 770sh.'

My own feeling is that while it might well be okay to use the same cable as ones made for other models, what I want is one that has some reassuring text on the packaging that says, 'For use with the Sharp 770SH'. As an ever protective owner, I'm very reluctant to unite my pure and virtuous Sharp with just any old accessory that comes a-courting.

So anyway, I'm looking to buy a XN-1DC30 data cable now. My question is, can anyone recommend an online retailer I can purchase one from? Preferably one you've used before.