Gameday Audio on mlb.com is only $15 for a whole year. You can get audio for any game, either home or away (so even when the Cards are on the road, you can get Shannon and Rooney). I realize your computer is in a different room from your TV, so, for the Cubs/Cards games, you may try muting the TV and turning on the radio. Pat and Ron are better than the smucks on TV.
By the way, Monday's game against the Braves is on ESPN starting at 6:00.
Alternate Audio
By the way, Monday's game against the Braves is on ESPN starting at 6:00.