I think that you can get an all star for $49.00 a night right now, as for flying, it is MUCH cheaper to fly from Buffalo, and that will run you $700 for four with taxes N/S... Not sure how long you are going but 5 day park hoppers are $260 for the adults and your 3 y/o is going to be 210.00.. and there there is food as well.
We are staying in the Cabins and plan on making our own food, that one is $155 a night. This is all in USD.
Hope This helps!