There's some on Ebay... not sure if it's their official way to get rid of their stuff.
Most likely this is one of their pagerank (?) servers that Google sold to business customers way back in the day.
* Edit: It seems these we called the Google Search Appliance. GSA https://www.youtube.com/watch?v=bMbvt1iARJ8
Commodity Dell server painted yellow.
e: oops, didn't refresh