Best Buy just released a 3.5″ version of the Infocast (it’s really just a Chumby One lightly reskinned).
It’s sitting on my kitchen counter (in front of a mini-food processor) running the Transit Board™ display.
It’s not actually useful, I need my reading glasses to see it (it would probably work better with a UI that showed one arrival at a time, in much larger fonts) but it demonstrates that we can get all the needed connectivity and processing power for a transit appliance for under $100 retail ($99.99).
I have a little more hope for a $99.99 Android device that UPS is supposed to deliver next week. It will be my first attempt to run a transit UI on an Android device.