As i see, current price is even lower - $6.45, probably because Symantec plans to "kill" this product in the future.
Here is an explanation:
http://us.norton.com/antivirus/"In order to better protect you, we have substantially enhanced our security services. We took everything you loved about Norton AntiVirus and added better protection, improved performance and superior design to create Norton Security. It’s the best of Norton for your PCs, Macs, smartphones and tablets."
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Anyway, FYI, SCforum's members prefer Mcafee & Free AVs.