These screens can easily be found on eBay and Amazon.
For the US Chromebook for example, I searched for the model number and LCD replacement like this "XE303C12 LCD replacement" on the Google. Found a new screen with Prime shipping on Amazon for about $45.00 US.
Install was as described in the other answer, but I did run into a small amount of adhesive tape on the bottom of my already broken screen and the bezel. I was not to worried about it but it took a little more force than I expected to get the bezel removed.