Hello,
You can contact Symantec Partners for the approx costing -
http://partnerlocator.symantec.com/public/search?country=98
In Symantec Endpoint Protection, license is counted as per machine basis.
A license lets you install the Symantec Endpoint Protection client on a specified number of computers. A license lets you download virus definitions, security content, and product updates from LiveUpdate.
Licensing Symantec Endpoint Protection
http://www.symantec.com/docs/HOWTO80778
You must purchase a license that covers each deployed client. One license covers all clients regardless of platform and version.
See Product license requirements
See Purchasing licenses
See Licensing enforcement rules.
Hope that helps!!