MLB Bundle up on Gamestop:
http://www.gamestop.com/games/mlb-12-the-show-for-playstation-3-and-ps-vita/99627
Requirements:
You must have both PS3 and PS Vita versions of the game.
You must use the same PSN account on both devices.
Your PS3 or PS Vita must be connected to PSN when you are ready to upload/download your save file (on PS Vita, you must be connected to PSN via WiFi; MLB 12 does not support cross platform save using 3G).
How it works:
During your Season, Franchise or Road to The Show modes only, after completion of a game, you can save your game and upload it to the cloud. From there you can download that save file from the cloud onto your PS Vita, or vice versa.
Not supported:
Pausing and saving the game at any point. The game must be completed.
Playing the game on PS Vita without the software.
Playing against someone else on a PS Vita while you are on your PS3 (Cross Platform Play) or vice versa.