The NFL season hasn't even started yet, but Fox Sports has already sold 85% of its Super Bowl ad slots, according to Bruce Horovitz at USA Today.

Horovitz reports that Fox Sports expects that figure to rise to 90% of inventory by the time the season kicks off Sept. 5. That percentage is in line with what CBS had sold for the 2013 Super Bowl this time a year ago.

USA Today reports that 30-second spots are going for more than $4 million, an increase from the $3.8 million average price for spots at the big game last year. 

The 2014 Super Bowl will take place Feb. 2, 2014 at MetLife Stadium in New Jersey.

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