how long do mac's limited editions usually last? i'll be in the states in july, do you think i'll still be able to get the cinderella stuff?

Limited Edition MAC stuff only lasts until they run out of the product. If your coming to the states, your most likely coming to a tourist place, and wherever you find a mac store close to where you will be going, it will most likely be gone unfortunately. I don’t think their limited edition things last more than a month, depending on the popularity.