OBD II to USB cable needed!!

Hi, I dunno if this is the place to put ma question, but i think its an engine related thing... I drive M6 2.3L 2004 and am installing centerfuse interface. it has the OBDII function, i am searching for an OBDII to usb cable so i can connect it to ma carputer. i searched in many places yet, nuthin found... Where can i get one? i need a reliable source please to ship outside the US.

thanx in advance and waitinf for replies