Up for sale is a Cobb Accessport Dongle, yes only the USB to OBD-II piece . When I purchased my WRX this was on the OBD-II port.
It does look used and has signs of wear and tear, small scratches, etc. It does seem to work though. I plugged it into a Windows based computer and it showed up in the device manager as a COBB2 FU and an LED inside the device lights up.
COBB website: COBB Tuning - AccessPORT Replacement Dongle
$40 or best offer - shipping included