Found an anti-virus review site where if you tell them your name and email, they'll give you coupon-codes for discounts. Most of the more popular brands have an average of 10% off, some a little less. Granted, I haven't confirmed any of them are valid yet but plan to soon so I'll post back. One of the best deal seems to be VIPRE.

http://www.pcantivirusreviews.com/coupons.html

They seem to give honest representations of the programs they review. You may want to check them out if you're in the market.

--fayejlee