Low-Priority VM’s are now in preview. These allow you to use unused capacity in azure to spin up Azure VM’s into a Scaleset for a fraction of the price of a normal VM. However these VM’s can be removed at any time when Azure needs the capacity back! They are idea for Dev/Test environments and Demos so give them a try!
If you are interested in pricing of the VM’s please check it out at https://azure.microsoft.com/en-gb/pricing/details/batch/