I love that everyone has the same idea as we did! We first found it outside of Cindy's Royal Table (on the ground of course!) and my daughter (then 4) and my mom picked it up and saved it to bring home. We were scavenging for it for the rest of the trip. We ended up losing our film canister that we were saving them in so my parents looked for more every time they went back. They even asked where to buy it. They were told in the parks that you cannot buy it anywhere. It is only used at special times within the park (parades, opening, birthdays, etc.).
Here is my great "Micket Dust" story...
A year later my daughter was scheduled to have surgery and my mom really wanted to give her some "Mickey Dust" to help her get better so she asked at City Hall how she might be able to get some for a special girl (without crawling on her hands and knees). They told her there was only one place she could get it and made a call. Someone came to pick them up and escorted them to Cinderella's Castle. They had a special meeting with the Fairy Godmother who took a picture with my mom and signed a special autograph for my daugher and then she reached deep into her pocket and pulled out a handful for my mom to bring home. We have a special "Mickey Dust" jar at home and add to it everytime we find more on the ground in the parks!