Microsoft has announced the End of Support date for Windows Server 2008R2 and SQL Server 2008 is January 15th, 2020 but is offering special dispensation for businesses that migrate their 2008R2 server’s or SQL 2008 workloads to Azure.
Further, with the Azure Hybrid benefit Microsoft doesn’t require you to re-purchase licensing to migrate to their cloud, you can use your existing licensing.
You can learn more about Azure costs compared to Amazon Web Services (AWS) costs here: http://aka.ms/Why5xmore
Here is a link to the Azure Calculator: https://azure.microsoft.com/en-us/pricing/calculator
Here you can find out more about the Azure Hybrid Benefit: https://azure.microsoft.com/en-us/pricing/hybrid-benefit/