Eugene you can purchase Disney Dollars at any Disney Store. Disney Dollars would be a great gift for the Grand Kids, depending on how old they are. If they don't understand that they CAN NOT use them as money on the ship then I would say go for it, but if they are to young to understand that and they would have to turn over their Disney Dollars to Mom or Dad to be applied to the stateroom charges then I would say don't even think of giving them Disney Dollars. I can see this good deed turning into a big problem for their parents. As I have suggested to you in your earlier post of this matter get them the onboard gift certificate which are applied to the stateroom account.