You can use virtual machine scale sets to deploy and manage a set of identical VM instances as a group. In addition to the support for Autoscale, load balancing, automatic OS image updates, and ease of deployment and management options, scale sets now include support for provisioning low-priority VMs.
Low-priority VMs are allocated on any excess capacity and can be evicted anytime, depending on the demand. You can use this option to run resilient, fault-tolerant applications and batch processing tasks at a fraction of the on-demand price, enabling significant cost savings. Low-priority VMs are available through scale sets with up to an 80 percent discount in all Azure regions.
To learn more, see the Low-priority VMs on scale sets article.