There is no glass replacement. I just got off the phone with Amazon Customer Support and they do not manufacture glass replacement pieces. In other words, if you break the glass you are out of luck. I've submitted feedback (via telephone customer support) for Amazon to begin producing replacement parts and urge you to do the same. Problem with being an early adapter is that what is normal protocol for business (in this case making replacement parts) is not yet developed.
Unfortunate since now I have a $230 awesome piece of tech that has a shattered screen. Customer service gave me $30 :/