Secret to getting cheap tickets to any baseball game! MLB tickets sites and stubhub will make available tickets but you will pay a premium. There is a way to get the best tickets at face value.
The trick is to go to the teams website on the first day the opponent comes to town. The unused tickets (wives/girlfriends who aren't coming) will be given back to the home team and put on the website that morning of the game. These are very good seats and at face value. This works for playoff games as well.
Tickets.com, stub hub, ticketmaster and the rest of the ticket vendors all do this.