NAV Multi-PC Version and Subscription Renewal

Well, I came back to Norton after several years away mostly because I was able to get a cheap version, 1 user, 3 PCs, for one year.  My question is: I see no pricing or WAY to renew a subscription for such a version (meaning a multi-PC version).  Granted, I have about a year, but how do I do so, and what is the pricing?