I haven't found any deals, but you can get a Chance to Win here:
http://malwaretips.com/Thread-ESET-Smart-Security-7-Daily-Giveaway-MalwareTips-com
We also have an ESET Nod32 Antivirus 7, if you don't mind using that instead?
http://malwaretips.com/Thread-ESET-Nod32-Antivirus-7-Daily-Giveaway-MalwareTips-com
There's also any external site contest for ESET Nod32 Antivirus:
http://malwaretips.com/Thread-Contest-ESET-NOD32-Antivirus-7-25-License