I'd assume you'd just get the game in the normal Xbox or PS packaging that comes in the starter pack separately. Though I must admit i'd rather get a starter pack with the game disc and 3 Disney playsets and 3 Disney figures. Why are people talking about blind packs?
I still think it'd be easier just to buy another Starter Pack. You will spend way more money buying everything separately, and so what if you have an extra base? Throw the other one out. This really makes it much harder for Avalanche.