How much would you pay for a 30-second slot during one of the most-watched events on TV? In the off chance you have $4 million burning a hole in your pocket, CBS Sports might like to talk with you. That’s the average cost of a 30-second Super Bowl ad spot on the network this year and $500,000 more expensive than last year’s average price – a then record $3.5 million. “We don’t confirm exact pricing, since all spots are sold with different considerations and often in different packages,” said CBS spokesman Dana McClintock. “But it’s safe to say that spots are going for $4 million each, and in some cases more.” Known advertisers so far include Pepsi, Audi, GoDaddy, Hyundai and Skechers. Which is at least $20 million for two-and-a-halfminutes of ads. While most 2013 Super Bowl ad spots sold in May of last year, some ad space can still be had – for a very expensive price.