This article presumes you have experimented with Zing on your own using a trial download, found and used Zing on Amazon EC2, or otherwise have determined Zing would work with your applications, but have not yet contacted Azul.
The best ways to reach Azul when ready to buy Zing are emailing email@example.com or completing the request form for generic Azul inquiries. An on-site trial is different from a self-guided trial because it typically involves you working closely with Azul to qualify Zing against your evaluation criteria. Azul wants to help you meet all your business justifications, in addition to ensuring a technical fit.
Many presales materials, Zing product datasheets, and service and support offerings are enumerated here and should provide all you need to research Zing for your use cases.
Still unsure? Email firstname.lastname@example.org and Azul will help figure out your needs.