NBA: Charges $29.95 a season for an "Audio League Pass," which includes access to live radio broadcasts of every home and away game, as well as the Real Networks software needed to use it.

"It's pretty expensive to do this," said Brenda Spoonemore, vice president of Internet services for NBA Entertainment. "To make sure we can keep offering it to our fans, we have to run this as a business."

•   MLB: Charges $9.95 a season for live online audio feeds of every home and away game. Price includes cost of the Real Networks software, and additional features like synchronized statistics, foreign language feeds and graphics of the field during the game.

•  NFL: Offers live Web radio broadcasts of the majority of its games for free.

According to NFL spokesman Brian McCarthy, 220 of the 248 football games were available on the Web in radio form last year and about 600,000 fans logged on to listen to them. Charging for the service hasn't been ruled out, he said.

•  NHL: Offers live Web radio broadcasts of its games free of charge.

Keith Ritter, president of NHL Interactive Cyber Enterprises:  "We're not in the business of putting barriers between our fans and the game."

•  NCAA: Is currently in transition with its Internet provider, but plans to offer many championship games online for free. Because of the NCAA structure, the availability of audio feeds of regular-season basketball games is up to the individual school or conference.