MLB.TV Help Center
How do I purchase At Bat?
To purchase an At Bat subscription within the Audio Player, you can either click on the subscribe link, or click on an active link for a game feed. After clicking the game link, you will be prompted to enter your MLB.com login information. If you are not an At Bat subscriber, there will be a "Buy Now" button that you can click on within the login prompt to purchase a subscription.