Microsoft announced a change in the pricing model for Azure Desired State Configuration from a per-node to a per-transaction pricing structure.  With the standard 15 minute refresh, the cost is about the same as per-node.  However, it’s possible to get the monthly price to under $1 US by setting the refresh rate to once or twice a  day.  Microsoft’s announcement can be found here.

My other posts on Azure DSC can be found here.