Hi Julie
Disney Dollars are the official currency of the Walt Disney World Resort, the Disneyland Resort and Disney Stores located in the United States and Puerto Rico. They come in dominations of $1, $5 and $10. After calling (407) W-DISNEY and speaking with a cast member, you only have two options of purchasing and it does not include putting money towards your reservation so you pre-pay for them.
It, actually, is pretty simple. First, you can purchase them via credit card, cashier's check or money order prior to your vacation and they can be mailed directly to your home. More information about this can be found by clicking
here. Or you can purchase your Disney Dollars when you check-in to your resort at the front desk or concierge desk. Disney Dollars are, also, available for purchase at Guest Relations in any of the theme parks or water parks.
I hope your vacation is memorable and magical and let me know if I can be of any further pixie dusted assistance.
Amy M*o*