Some of these will be originated by MLB Network, while many will be rebroadcasts of local cable broadcasts. If you don’t get MLB Network as part of your cable offering, you can subscribe via MLB.tv.
Alas, there’s no spring-only subscription via MLB.tv, so you’ll need to pony up for a full season at $118.99. One advantage of doing this: those pesky regional blackout restrictions present in the season are not applied to every spring training game, so you can watch your home teams in action. Again, this isn’t true of every game, but they are noted in the full schedule listed above.