Well, they are classed as a celluar product, so the chances are, you'll be able to get a data cable that'll fit, and it'll come with the advantage of being pre-wired! (of course, you may have to swap some of the wires, as they are unlikely to use all 14 pins).
The other option is to buy them direct from OpenPandora as a spare part. I'd imagine that in ones, they'll probably be about 80p - £1 each.