The average 30-second spot on network television cost $104,051 during the first six months of this year, down about 10 percent from the same period a year ago, according to MediaWeek magazine, which cited figures from TargetCast. Fox commanded the highest unit price, $200,008 per spot, while those for ABC and CBS went for an average of $94,000. NBC, the last-place network, was also last place in spot revenue, taking in just $76,211 per commercial. Costs for cable-TV ads rose during the period, with ESPN commanding the highest price for a 30-second spot, $19,301. USA Network and TNT tied for second place with spots averaging $15,500 each.