The dongle could be had for less than $60. If you get a Class I Bluetooth device, you don't need to use an antenna, especially if you're not using it in anything besides a demo. A Class I devices will transmit ~100m, using the built-in antenna that comes with the device. The Linksys BT100 is a Class I device and can be found for ~$50-$60 USD.
Check the Trifinite.org site.
You do understand that the device is built into the car, right? The device is free, but the car will cost you $25000.![]()




