Fry's Electronics offers select Internet security software for Windows for $0 after mail-in rebate. Even better, these items are eligible for free shipping. Some require you to be upgrading from a previous version of the software or a competitor's product. Rebates expire June 12 unless otherwise noted. The deals:
Bitdefender Total Security 2014 3-User 2-Year for PC for $0 after $40 and $30 mail-in rebates ($34 low)
The Microsoft founder -- and richest man in the world -- also suggests one great book to read.