If you’re having a hard time getting tickets for the Cubs, the Sox, The Bulls, or pretty much any other Chicago sporting event, I found a site that can help you out. http://www.chicagosbesttickets.com/ was just launched this year, and isn’t charging you $500 for a ticket that’s only worth $30. Chances are, they have what you’re looking for.
For big events, like Cubs/Brewers or Cubs/Sox, be sure to call them as soon as possible.