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Norton Antivirus (Norton Security)
If you can get a friend or family member to chip in with you, and they need anti-virus as well, then by far the best bang for your buck is by purchasing the 5-device ($7/device/year) or 10-device ($4.50/device/year) pack. Otherwise, you can purchase the $19.99 single-device package from Norton directly, and turn off the auto-renewal immediately after purchasing. You'll just have to buy another key-card or purchase again when your expiration date nears.