Yes, you can purchase there from your VAR
To activate the product from SEPM.
1. Open SEPM.
2. Select Admin tab.
3. Under task select "Activate Licence".
4. Select "I have a Symantec Licence File".
5. Click on Add file.
6. Select the .slf file (from the appropriate saved location).
7. Click on Next.
8. Again click on Next.
9. Click On Finish.
Licensing Symantec Endpoint Protection
http://www.symantec.com/docs/HOWTO55056