The $10,000.00 (USD) per node holds true.
For some mysterious reason, data nodes in Hadoop or Appliances you end up paying around 10K a node (list price)
Even though there's Moore's law, you still end up paying 10K list, albeit getting more machine for your buck.
I've seen this when pricing out DELL, IBM xSeries, SGI/Rackable, and now Netezza.
Interesting....