A powerful, scalable database solution for modern businesses.
SQL Server Express is a free version of SQL Server, which is a great solution for an in-house database. All you need is a computer to host it on.
Microsoft Azure is a Cloud version of SQL Server. A small cloud-hosted database (less than 2GB) can cost as little as $10 per month and can be upsized at any time without interruption to workflow.
Azure includes a continuous backup and restore facility, which is set and forget. This is a great way to get your database online without the headaches of owning, securing, and maintaining your own server.