SharePoint licenses – Similar to the Windows Server licensing structure you need a SharePoint Server license and a SharePoint CAL (Standard CAL with or without and additionalEnterpriseCAL) to implement SharePoint 2013. While Microsoft offers a SharePoint Foundation server included in most Windows Server licenses, its features are very limited.
The SharePoint licensing is very simple. Set cost for Standard and Enterprise. Need CALs for internal users only. No CALs for external users. We have Ent edition. I think it was around 7K - 12K for the license. CALs were really inexpensive.
[EDIT] Uh I was a bit off there.
So for SharePoint. We paid 6K for the Server software. Then the Standard CALs were 104/seat. For users to use Enterprise features was an additional CAL of $94.
There was no 'Enterprise' server cost.. only Enterprise CAL cost.