vMotion and sVMotion is not part of essentials edition but you can purchase individual features, take a look at the licensing page for more information: http://www.vmware.com/products/vsphere/upgrade-center/licensing.html
Feature Licenses Purchased Separately:
In the vSphere licensing model, features cannot be licensed separately. However it is possible to add features onto an edition license. This add-on is fixed, which means it is done by VMware at the time of license delivery and the feature cannot be separated from the edition at a later stage.
There is a chart that describes other features that can be purchase separately.
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William Lam
VMware vExpert 2009
VMware ESX/ESXi scripts and resources at:
VMware Code Central - Scripts/Sample code for Developers and Administrators
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