C.,
Since it's been explained for what the differences, let me tell you some of the deals I found. Costco has (Costco in Everett no longer has this package, but they might be at others and they do have them at costco.com) had the L2, a game (green L2 with a wall-e game or pink L2 a pet pals) and the case for $79. Broken down the game is usually over $70, game about $25, and the case is $15. All can be found on sale at one time or another. I also saw on Cyber Monday on Wal-mart they ran a similar package deal, so you might watch to see if they do it as well. It was the L2 and 2 games, no case for about the same price ($69). Leapster.com will run specials and if you are watching can find bank up deals, I've picked up other products as well.
Good luck and have a fantastic holiday!