http://cgi.ebay.com.au/OBD-2-OBDII-E...item3ef9cd1463
I'm pretty certain that any OBDII to USB cable will work.
I found one on deal extreme but it was OBD (as opposed to OBDII). It looked to have the same number of pin layout but i'm not sure if the wiring / protocol is different.
I wonder if the OBDII to Mini USB cable that comes with the EcuDataScan would work? Would just need a Mini USB to USB Converter...