I'll ping Vitaliy on this, he should make his own adapter in the same form factor as this one. He already has a TTL obd2 board, just needs the nice tiny package and connector
Your website doesn't list links for the hardware for people to build their own, so I did some searching.
The OBD2 adapter is made by arduinodev (http://www.arduinodev.com/hardware/obd-kit/) for $50
The LCD shield is sold by DFRobot. Not sure who actually makes it (http://www.dfrobot.com/index.php?rou...product_id=347) for $24
Of course, the Arduino is sold by sparkfun (http://www.sparkfun.com/products/11021) for $30