I got mine at the ticket booth while I was buying my Disney Premier Passport. I traded $100 in real money for $100 in Disney Dollars, a few $10s, $5s, and lots of $1s. I think you can even buy these with a credit card, which is cool because it doesn't get charged as a cash advance, just a regular purchase. There seems to be a limit of $50 if you use a credit card (at least at WDW, I'm not sure about DLR). Also, when you use your Disney Dollars you get your change in real money.