Gasoline and food aren't the only things going up in price these days. A 30-second spot during the XLIII Super Bowl [1] in Tampa Bay will cost $3 million [2].

The starting price this year was $2.7 million and the price for a spot during Super Bowl I was $42,500 on CBS and $37,500 on NBC (it was the only time the game aired on two networks). Here's a list of Super Bowl commercial costs throughout the years [3].
Links:
[1] http://www.tampabaysuperbowl.com/sponsor_sb43.htm
[2] http://news.yahoo.com/s/nm/20080506/tv_nm/nbc_superbowl_dc
[3] http://www.msnbc.msn.com/id/16874732/?pg=1#biz_super_bowl_ads_070129