Just wanted to share what I found in case someone else is interested. I had seen IBUS interfaces for sale before, but for a serial port, which forced some of us to buy a serial-2-usb adapter. The other day I found one that is already using the usb port, so it will save someone the extra $$ to buy the serial-2-usb adapter. Anyway, if you are interested take a look at http://www.eedesignkits.com. It uses the melexis chip so it has collision detection. I have one from them and it works great, though I still have to work on the custom software part of my project. ;-)

Hope someone finds this useful! Later.