Through our last visit the cost was $10 per day rental. I assume it is still the same. If you have a medical need for refrigeration Disney will waive the rental fee. We usually request one before we arrive and it is sitting in the room when we get there. If it isn't, they will usually have one delivered within the hour. It doesn't hold a lot so don't overbuy groceries. We usually make a grocery store stop and buy lots of water and pop and refill it as necessary. If you are driving down and will be staying more than 5 or 6 days you might consider buying a small fridge at Sears and taking it with you. We bought one for $70 for a two week stay and left it for the staff to do whatever they wanted with it. You could also buy a cooler and just fill it with ice every couple of days.