There are roughly 2400 baseball games in a season, but depending on your TV situation, you only get a small fraction of them. That sucks, especially if you're not in your favored team's home market. Maybe one day we'll be able to order à la carte channels, but until then your best bet for watching your home-away-from-home team is MLB.TV Premium.
It's a pretty sweet deal—you get to stream almost every single regular season MLB game live, with either the home or away team commentators, in HD quality. All those games stream on the excellent MLB At Bat app as well. If you've got an Xbox, PS3, Roku or Apple TV you can use that to watch games on your television. Usually a season-long subscription to MLB.TV premium costs $115 per year, but here's a link that'll get you the rest of the season for $57, which is half price, and we're not even at the All-Star Break yet. This deal hits solidly under expected price per game (EPG.) That's how you play moneyball. [MLB via 9to5Toys]
Update: I would be remiss to not mention—as many commenters have pointed out—that Major League Baseball blacks out MLB.TV for your home teams and all national games.
Update 2: It's dead. Hope you got in while the getting was good!
• MLB.TV Premium Subscription ($57) | Major League Baseball | Originally $115 | Click "purchase as guest" and you'll see the reduced price.
But if you need a new computer, Amazon just cut a bunch of Mac prices by $150. Standard configuration Macbook Airs are $100 off, and standard configuration iMacs get a $150 haircut. [Amazon - iMac] [Amazon - Macbook Air]
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