OBDLink SX
Where to Buy
As of 2017-06 the device is available via amazon for some EUR 50
Usage on Mac OS X
After connecting the USB cable to your MAC you can check whether the device is visible with the command
lsusb
Bus 004 Device 001: ID 0403:6015 Future Technology Devices International, Ltd Bridge(I2C/SPI/UART/FIFO)