Standard_D4ahs_v4 is an Azure VM size with 4 vCPUs. In Australia Southeast it costs $0.25 per hour on demand ($182.50 per month) for Linux; a 1-year reserved instance with no upfront costs $0.1498 per hour, 40% less. Spot capacity is about $0.0462 per hour.
Prices by region
USD per hour, Linux. Reserved prices are no upfront, standard. Cheapest on-demand first.