Disney Keys
Each key is released to celebrate a special Disney anniversary or event.
The keys are released as "SPECIAL EDITION" as they are very limited and will not be re-released and total edition counts are not known (though at times there is speculation from the trading community).
They are very limited, so you usually have to move fast on their release day before they run out. In the past, shoppers would have to make a qualifying purchase so they can get the key.