i would take it into levels. 5 dollars could do it, but i woud recommend playing more freerolls until you even have more. since they are a free buyin, your not losing any of your bankroll, and you are still able to get a good value out of it, the carbon gmaes have a value usually close to a 60 cent buy in, so i would consider these to be level 0 or 1, i woud continue to play the freerolls until you have enough to play buyins higher then 60 cents comfortably.