Overstock Deals via Amazon offers the Kaspersky One Universal Security 5-Device for Windows and Mac, model no. ONE1205121USZZ, for $12.64 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $4.48.) That's the lowest total price we could find now by $27, although we saw it for $13 less in October. This security software works on laptops, desktops, tablets, and smartphones.

Upgrading from a previous version or competing software and don't mind rebates? Purchase it from Fry's Electronics for $79.99 with free shipping and redeem these $45 and $35 mail-in rebates to cut the price to $0. Rebates end December 27.